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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Derivatives | $ 384 | $ 560
Derivative Liability, Fair Value, Gross Liability | (788) | (746)
Derivative Asset, Fair Value, Amount Offset Against Collateral | (18) | (47)
Derivative Liability, Fair Value, Amount Offset Against Collateral | 18 | 47
Derivative Asset, Collateral, Obligation to Return Cash, Offset | (318) | (397)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 318 | 397
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 48 | 116
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 452 | 302
Without offsetting agreements [Member] |  |
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (399) | (163)
OTC Contracts [Member] |  |
Asset Derivatives | 41 | 158
Derivative Liability, Fair Value, Gross Liability | (39) | (173)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 343 | 402
Derivative Liability, Fair Value, Gross Liability | $ (350) | $ (410)

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