Supplemental Information (Derivatives and Hedging - Counterparty Credit Risk) (Details) - USD ($) $ in Millions |
Jun. 30, 2016 |
Dec. 31, 2015 |
---|---|---|
Derivative, Credit Risk Related Contingent Features [Abstract] | ||
Securities held as collateral | $ 1,038 | $ 1,277 |
Cash collateral | 2,991 | 1,141 |
Total fair value of collateral | 4,882 | |
Collateral Already Posted, Aggregate Fair Value | 861 | |
Exposure to counterparties including interest net collateral excluding embedded derivatives | 511 | |
Derivative liability after collateral and outstanding interest payments excluding embedded derivatives | 721 | |
Amounts Offset In Statement Of Financial Position [Member] | ||
Derivative, Credit Risk Related Contingent Features [Abstract] | ||
Securities held as collateral | (54) | (107) |
Cash collateral | $ 3,843 | $ 1,784 |