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Fair Value of Financial Instruments Fair Value of Financial Instruments - Schedule of Level 3 Inputs Reconciliation for Liabilities (Details) (Derivative liabilities, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative liabilities
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 37 $ 42 $ 38 $ 38
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 4 4 8 15
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 4 3 8 13
Settlements (6) (9) (14) (25)
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 (1) (1) (2)
Ending balance 39 39 39 39
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ 4 $ 4 $ 8 $ 15