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Derivative Assets And Liabilities Derivative Assets and Lianilities (Offsetting Agreements Netting Table) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Asset Derivatives | $ 168 | $ 384
Derivative Liability, Fair Value, Gross Liability | (717) | (788)
Derivative Asset, Fair Value, Amount Offset Against Collateral | (44) | (18)
Derivative Liability, Fair Value, Amount Offset Against Collateral | 44 | 18
Derivative Asset, Collateral, Obligation to Return Cash, Offset | (64) | (318)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 64 | 318
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 60 | 48
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 609 | 452
Without offsetting agreements [Member] |  |
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (448) | (399)
OTC Contracts [Member] |  |
Asset Derivatives | 53 | 41
Derivative Liability, Fair Value, Gross Liability | (71) | (39)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 115 | 343
Derivative Liability, Fair Value, Gross Liability | $ (198) | $ (350)

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