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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 ($) | Dec. 31, 2020 | Dec. 31, 2019
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross amounts recognized in the consolidated balance sheet, Asset | $ 182,000,000 | $ 288,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Asset | (156,000,000) | (84,000,000)
Cash collateral received, Asset | 0 | (34,000,000)
Net amounts, Asset | 26,000,000 | 170,000,000
Gross amounts recognized in the consolidated balance sheet, Liability | 525,000,000 | 97,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Liability | (156,000,000) | (84,000,000)
Cash collateral received, liability | (36,000,000) | 0
Net amounts, Liability | $ 333,000,000 | $ 13,000,000

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