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Financial Instruments - Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross amounts recognized in the consolidated balance sheet, Asset | $ 130 | $ 995
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Asset | (94) | (131)
Cash collateral (received) posted, Asset | (3) | (529)
Net amounts, Asset | 33 | 335
Gross amounts recognized in the consolidated balance sheet, Liability | 217 | 134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Liability | (94) | (131)
Cash collateral (received) posted, Liability | 0 | 0
Net amounts, Liability | $ 123 | $ 3

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