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Derivative Financial Instruments - Gross and net amounts for OTC derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Asset derivatives |  |
Asset derivatives gross amount | $ 120 | $ 127
Asset derivatives, gross liability | (5) | (1)
Derivative assets net amount on balance sheet | 115 | 126
Liability derivatives |  |
Liability derivatives gross amount | (308) | (369)
Liability derivatives, gross asset | 1 | 6
Derivative liabilities net amount on balance sheet | (307) | (363)
OTC derivatives |  |
Asset derivatives |  |
Asset derivatives gross amount | 16 | 8
Asset derivatives, gross liability | (6) | (7)
Derivative, collateral, right to reclaim cash | (7) | 1
Derivative assets net amount on balance sheet | 3 | 2
Derivative assets received under securities collateral | 0 | 0
Derivative asset, fair value, amount offset against collateral | 3 | 2
Liability derivatives |  |
Liability derivatives gross amount | (8) | (26)
Liability derivatives, gross asset | 6 | 7
Derivative liability offsets under cash collateral pledged | 0 | 7
Derivative liabilities net amount on balance sheet | (2) | (12)
Derivative liabilities received under securities collateral | 0 | 3
Derivative liability, fair value, amount offset against collateral | $ (2) | $ (9)

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