|
Schedule Of Contractual Maturities Of Debt Securities Available For Sale (Detail) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Gain (Loss) on Investments [Line Items] | ||
| Due within one year, Amortized Cost | $ 374 | |
| Due after one year through five years, Amortized Cost | 1,844 | |
| Due after five years through ten years, Amortized Cost | 2,754 | |
| Due after ten years, Amortized Cost | 1,711 | |
| Mortgage and asset-backed securities, Amortized Cost | 2,360 | |
| Total debt securities, Amortized Cost | 9,043 | 8,928 |
| Due within one year, Fair Value | 377 | |
| Due after one year through five years, Fair Value | 1,917 | |
| Due after five years through ten years, Fair Value | 2,968 | |
| Due after ten years, Fair Value | 1,918 | |
| Mortgage and asset-backed securities, Fair Value | 2,485 | |
| Total debt securities, Fair Value | $ 9,665 | $ 9,453 |