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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Asset Derivatives | $ 363 | $ 454
Derivative Liability, Fair Value, Gross Liability | (672) | (532)
Derivative Asset, Fair Value, Amount Offset Against Collateral | (4) | (17)
Derivative Liability, Fair Value, Amount Offset Against Collateral | 4 | 17
Derivative Asset, Collateral, Obligation to Return Cash, Offset | (338) | (309)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 338 | 309
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 21 | 128
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (330) | (206)
Without offsetting agreements [Member] |  |
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (194) | (176)
OTC Contracts [Member] |  |
Asset Derivatives | 25 | 63
Derivative Liability, Fair Value, Gross Liability | (58) | (47)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 338 | 391
Derivative Liability, Fair Value, Gross Liability | $ (420) | $ (309)

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