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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 ($) | Mar. 31, 2018 | Dec. 31, 2017
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross amounts recognized in the consolidated balance sheet, asset | $ 109,000,000 | $ 130,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset | (103,000,000) | (94,000,000)
Cash collateral received, asset | 0 | (3,000,000)
Net amounts, asset | 6,000,000 | 33,000,000
Gross amounts recognized in the consolidated balance sheet, liability | 324,000,000 | 217,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability | (103,000,000) | (94,000,000)
Cash collateral received, liability | 0 | 0
Net amounts, liability | $ 221,000,000 | $ 123,000,000

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