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Fair Values of Assets and Liabilities Textuals (Details) (USD $)
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6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | |||||||||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jun. 30, 2012
US States and Political Subdivisions [Member]
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Jun. 30, 2012
US States and Political Subdivisions [Member]
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Jun. 30, 2013
Private Equity Funds [Member]
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Jun. 30, 2013
Venture Capital Funds [Member]
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Jun. 30, 2013
Offshore Funds [Member]
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Dec. 31, 2012
Offshore Funds [Member]
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Jun. 30, 2013
Lease Financing [Member]
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Dec. 31, 2012
Lease Financing [Member]
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Jun. 30, 2013
Non modified loans [Member]
Maximum [Member]
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Dec. 31, 2012
Non modified loans [Member]
Maximum [Member]
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Jun. 30, 2013
Non modified loans [Member]
Minimum [Member]
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Dec. 31, 2012
Non modified loans [Member]
Minimum [Member]
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Jun. 30, 2013
Residential [Member]
Government Insured Or Guaranteed [Member]
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Dec. 31, 2012
Residential [Member]
Government Insured Or Guaranteed [Member]
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Jun. 30, 2013
Residential [Member]
Non Government Insured Or Guaranteed [Member]
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Dec. 31, 2012
Residential [Member]
Non Government Insured Or Guaranteed [Member]
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Jun. 30, 2013
Consumer [Member]
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Dec. 31, 2012
Consumer [Member]
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Jun. 30, 2013
Collateralized debt obligations [Member]
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Dec. 31, 2012
Collateralized debt obligations [Member]
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Jun. 30, 2013
Collateralized loan obligations [Member]
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Jun. 30, 2013
Available for sale Securities [Member]
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Jun. 30, 2013
Carrying amount [Member]
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Dec. 31, 2012
Carrying amount [Member]
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Jun. 30, 2013
Estimated fair value [Member]
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Dec. 31, 2012
Estimated fair value [Member]
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Jun. 30, 2013
Estimated fair value [Member]
Level 1 [Member]
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Dec. 31, 2012
Estimated fair value [Member]
Level 1 [Member]
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Jun. 30, 2013
Estimated fair value [Member]
Level 2 [Member]
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Dec. 31, 2012
Estimated fair value [Member]
Level 2 [Member]
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Jun. 30, 2013
Estimated fair value [Member]
Level 3 [Member]
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Dec. 31, 2012
Estimated fair value [Member]
Level 3 [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] | |||||||||||||||||||||||||||||||||||
| Total trading assets (excluding derivatives) | $ 5,000,000 | $ 21,000,000 | |||||||||||||||||||||||||||||||||
| Securities available for sale | 249,439,000,000 | 235,199,000,000 | 705,000,000 | 644,000,000 | |||||||||||||||||||||||||||||||
| Net unrealized gains (losses) on trading securities | (646,000,000) | 131,000,000 | 305,000,000 | ||||||||||||||||||||||||||||||||
| Fair Value Disclosure, Transfers from Level 3 to Level 2 | 3,900,000,000 | 3,900,000,000 | 202,000,000 | 10,600,000,000 | |||||||||||||||||||||||||||||||
| Trading and available for sale securities | 710,000,000 | 665,000,000 | |||||||||||||||||||||||||||||||||
| Cost to service per loan | 312 | 437 | 88 | 90 | |||||||||||||||||||||||||||||||
| Mortgages held for sale | 35,402,000,000 | 42,305,000,000 | 909,000,000 | 942,000,000 | 79,000,000 | 103,000,000 | |||||||||||||||||||||||||||||
| Redemption restriction for investment | 216,000,000 | 189,000,000 | |||||||||||||||||||||||||||||||||
| Liquidation period | 12 years | 5 years | |||||||||||||||||||||||||||||||||
| Loans | 801,974,000,000 | 799,574,000,000 | 11,766,000,000 | 12,424,000,000 | 438,502,000,000 | 438,376,000,000 | 773,296,000,000 | 772,351,000,000 | 0 | 0 | 57,917,000,000 | 56,237,000,000 | 715,379,000,000 | 716,114,000,000 | |||||||||||||||||||||
| Capital Lease Obligation | 11,000,000 | 12,000,000 | |||||||||||||||||||||||||||||||||
| Loan Commitments And Standby, Commercial And Similar Letters of Credit | 608,000,000 | 586,000,000 | 608,000,000 | 586,000,000 | |||||||||||||||||||||||||||||||
| Total derivative loan commitments | $ (615,000,000) | $ 497,000,000 | |||||||||||||||||||||||||||||||||