|
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
|
Sep. 30, 2012
|
Dec. 31, 2011
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investment securities (Note 3) |
$ 48,695 |
$ 47,359 |
|
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
20,601 |
20,535 |
|
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
3,578 |
3,235 |
|
Domestic Corporate Debt Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Domestic Corporate Debt Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
24,179 |
23,770 |
|
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
3,073 |
2,824 |
|
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
6 |
4 |
|
Commercial Mortgage Backed Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Commercial Mortgage Backed Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
3,079 |
2,828 |
|
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
|
0 |
|
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
4,338 |
3,157 |
|
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
153 |
77 |
|
US States and Political Subdivisions Debt Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
US States and Political Subdivisions Debt Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
4,491 |
3,234 |
|
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
70 |
71 |
|
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
1,214 |
1,058 |
|
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
1,295 |
1,204 |
|
Foreign Corporate Debt Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Foreign Corporate Debt Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
2,579 |
2,333 |
|
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
726 |
930 |
|
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
4,819 |
4,040 |
|
Asset-backed Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Asset-backed Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
5,545 |
4,970 |
|
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
895 |
1,003 |
|
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
1,021 |
1,444 |
|
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
41 |
84 |
|
Foreign Government Debt Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Foreign Government Debt Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
1,957 |
2,531 |
|
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
3,309 |
3,805 |
|
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
267 |
253 |
|
US Treasury and Government [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
US Treasury and Government [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
3,576 |
4,058 |
|
Retained Interest [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Retained Interest [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Retained Interest [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
29 |
35 |
|
Retained Interest [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Retained Interest [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
29 |
35 |
|
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
547 |
715 |
|
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
15 |
18 |
|
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
11 |
17 |
|
Available-for-sale Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Available-for-sale Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
573 |
750 |
|
Trading [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
263 |
241 |
|
Trading [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Trading [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Trading [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Trading [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
263 |
241 |
|
Derivatives [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Derivatives |
0 |
0 |
| Derivative Assets |
0 |
0 |
|
Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Derivatives |
4,491 |
4,503 |
| Derivative Assets |
11,876 |
14,830 |
|
Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Derivatives |
14 |
20 |
| Derivative Assets |
155 |
160 |
|
Derivatives [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Derivatives |
(3,883) |
(4,025) |
| Derivative Assets |
(7,133) |
(5,319) |
|
Derivatives [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Derivatives |
622 |
498 |
| Derivative Assets |
4,898 |
9,671 |
|
Other 1 [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Other assets |
0 |
0 |
| Other liabilities |
0 |
0 |
|
Other 1 [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Other assets |
0 |
0 |
| Other liabilities |
24 |
25 |
|
Other 1 [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Other assets |
416 |
388 |
| Other liabilities |
0 |
0 |
|
Other 1 [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Other assets |
0 |
0 |
| Other liabilities |
0 |
0 |
|
Other 1 [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Other assets |
416 |
388 |
| Other liabilities |
24 |
25 |
|
Total [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Total assets |
1,775 |
2,030 |
| Total liabilities |
0 |
0 |
|
Total [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Total assets |
48,563 |
51,169 |
| Total liabilities |
4,515 |
4,528 |
|
Total [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Total assets |
10,804 |
9,538 |
| Total liabilities |
14 |
20 |
|
Total [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Total assets |
(7,133) |
(5,319) |
| Total liabilities |
(3,883) |
(4,025) |
|
Total [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Total assets |
54,009 |
57,418 |
| Total liabilities |
646 |
523 |
|
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
2,390 |
2,568 |
|
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
34 |
41 |
|
Residential Mortgage Backed Securities [Member] | Netting Adjustment [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
0 |
0 |
|
Residential Mortgage Backed Securities [Member] | Net Balance [Member]
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
| Investments, Fair Value Disclosure |
$ 2,424 |
$ 2,609 |