v2.4.0.6
Derivative Instruments and Hedging Activities (Notional and Fair Value of Protection Sold and Purchased through Credit Default Swaps) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount $ 1,895,591 $ 2,438,011
Credit risk derivative liabilities, fair value 10,138 [1],[2] 92,483 [1],[2]
Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 444,888 487,685
Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 583,774 831,042
Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 717,100 788,074
Credit Default Swap, Selling Protection [Member] | Over 5 Years
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 149,829 331,210
Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,893,192 2,432,404
Credit risk derivative liabilities, fair value 10,883 [1],[2] 93,629 [1],[2]
Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 444,092 487,620
Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 583,649 828,686
Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 716,945 787,357
Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 148,506 328,741
Credit Default Swaps [Member] | Credit Default Swap, Buying Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,907,401 2,462,261
Credit risk derivative assets, fair value (14,656) (101,694)
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,069,474 1,325,045
Credit risk derivative liabilities, fair value 2,889 [1],[2] 47,045 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 34,575 44,000
Credit risk derivative liabilities, fair value (204) [1],[2] 1,536 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 69,261 68,786
Credit risk derivative liabilities, fair value (325) [1],[2] 1,597 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 217,476 324,972
Credit risk derivative liabilities, fair value (2,740) [1],[2] 8,683 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 447,234 529,517
Credit risk derivative liabilities, fair value (492) [1],[2] 4,789 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 300,928 357,770
Credit risk derivative liabilities, fair value 6,650 [1],[2] 30,440 [1],[2]
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 296,392 306,743
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 2,368 1,290
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 10,984 12,416
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 66,635 67,344
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 124,662 131,588
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 91,743 94,105
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 340,169 504,298
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 6,592 5,681
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 16,804 22,043
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 72,796 124,445
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 145,462 218,262
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 98,515 133,867
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 356,270 330,454
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 19,848 24,087
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 34,280 23,341
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 67,285 85,543
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 142,714 115,320
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 92,143 82,163
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 76,643 183,550
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 5,767 12,942
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 7,193 10,986
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 10,760 47,640
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 34,396 64,347
Single Name Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 18,527 47,635
Single Name Credit Default Swap [Member] | Credit Default Swap, Buying Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,029,543 1,315,333
Credit risk derivative assets, fair value (2,456) (45,345)
Total Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 823,718 [3] 1,107,359 [3]
Credit risk derivative liabilities, fair value 7,994 [1],[2],[3] 46,584 [1],[2],[3]
Total Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 147,700 [3] 180,877 [3]
Total Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 243,480 [3] 324,388 [3]
Total Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 360,675 [3] 456,903 [3]
Total Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 71,863 [3] 145,191 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 551,630 787,228
Credit risk derivative liabilities, fair value 5,664 29,475
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 103,686 [3] 150,806 [3]
Credit risk derivative assets, fair value (1,377) [1],[2],[3] (907) [1],[2],[3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 31,103 [3] 47,176 [3]
Credit risk derivative liabilities, fair value (55) [1],[2],[3] 1,053 [1],[2],[3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 13,672 [3] 53,880 [3]
Credit risk derivative liabilities, fair value (155) [1],[2],[3] 2,470 [1],[2],[3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 306,253 [3] 375,474 [3]
Credit risk derivative liabilities, fair value (862) [1],[2],[3] 8,365 [1],[2],[3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 369,004 [3] 480,023 [3]
Credit risk derivative liabilities, fair value 10,443 [1],[2],[3] 35,603 [1],[2],[3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 18,652 [3] 48,115 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,255 [3] 6,584 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 2,684 [3] 5,202 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 27,720 [3] 8,525 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 97,389 [3] 112,451 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 36,005 [3] 49,997 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 9,479 [3] 15,349 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 5,423 [3] 18,996 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 105,870 [3] 99,004 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 86,703 [3] 141,042 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 45,789 [3] 33,584 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 12,026 [3] 9,498 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 5,440 [3] 17,396 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 143,562 [3] 235,888 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member] | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 153,858 [3] 160,537 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, AAA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 3,240 [3] 19,110 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, AA [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 8,343 [3] 15,745 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, A [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 125 [3] 12,286 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | Internally Assigned Grade, BBB [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 29,101 [3] 32,057 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member] | Over 5 Years | External Credit Rating, Non Investment Grade [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 31,054 [3] 65,993 [3]
Index and Basket Credit Default Swap [Member] | Credit Default Swap, Buying Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 454,800 601,452
Credit risk derivative assets, fair value (5,124) (24,373)
Tranched Index and Basket Credit Default Swap [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 272,088 320,131
Credit risk derivative liabilities, fair value 2,330 17,109
Tranched Index and Basket Credit Default Swap [Member] | Credit Default Swap, Buying Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 423,058 545,476
Credit risk derivative assets, fair value (7,076) (31,976)
Single Name, and Non-tranched Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,600,000 2,100,000
Single Name, and Non-tranched Index and Basket Credit Default Swaps [Member] | Credit Default Swap, Buying Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 1,500,000 1,900,000
Other Contracts | Credit Default Swap, Selling Protection [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 2,399 [4],[5] 5,607 [4],[5]
Credit risk derivative assets, fair value (745) [1],[2],[4],[5] (1,146) [1],[2],[4],[5]
Other Contracts | Credit Default Swap, Selling Protection [Member] | Years To Maturity - Less Than 1 [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 796 [4],[5] 65 [4],[5]
Other Contracts | Credit Default Swap, Selling Protection [Member] | More than One and within Three Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 125 [4],[5] 2,356 [4],[5]
Other Contracts | Credit Default Swap, Selling Protection [Member] | More than Three and within Five Years from Balance Sheet Date [Member]
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount 155 [4],[5] 717 [4],[5]
Other Contracts | Credit Default Swap, Selling Protection [Member] | Over 5 Years
    
Credit Derivatives [Line Items]    
Credit risk derivatives, notional amount $ 1,323 [4],[5] $ 2,469 [4],[5]
[1] Fair value amounts are shown on a gross basis prior to cash collateral or counterparty netting.
[2] Fair value amounts of certain credit default swaps where the Company sold protection have an asset carrying value because credit spreads of the underlying reference entity or entities tightened during the terms of the contracts.
[3] Credit ratings are calculated internally.
[4] Other credit contracts include CLNs, CDOs and credit default swaps that are considered hybrid instruments.
[5] Fair value amount shown represents the fair value of the hybrid instruments.