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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 419 | $ 321
Derivative Liability, Fair Value, Gross Liability | (931) | (560)
Counterparty netting | (49) | (21)
Counterparty netting | 49 | 21
Payments on margin deposit | (306) | (263)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 306 | 263
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 64 | 37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (576) | (276)
Without offsetting agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 147 | 219
OTC Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 112 | 45
Derivative Liability, Fair Value, Gross Liability | (430) | (58)
Broker cleared derivative contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 307 | 276
Derivative Liability, Fair Value, Gross Liability | $ (354) | $ (283)

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