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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3)        
Balance at the beginning of the period $ 5 $ 7 $ 4 $ 7
Total gains or losses included in earnings 0 0 0 0
Total gains or losses included in other comprehensive income (1) 1 0 1
Purchases, issuances, and settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at the end of the period 4 8 4 8
Additional losses included in earnings due to reclassification from other comprehensive income for:        
Securities sold during the period ended June 30 0 0 0 0
Securities still held at June 30 $ 0 $ 0 $ 0 $ 0