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Derivative and Other Financial Instruments (Schedule of Offsetting Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Derivative assets |  |
Gross amounts recognized in the Balance Sheet | $ 76 | $ 83
Gross amounts not offset in the Balance Sheet | 11 | 16
Net amount | 65 | 67
Derivative liabilities |  |
Gross amounts recognized in the Balance Sheet | 52 | 49
Gross amounts not offset in the Balance Sheet | 11 | 16
Net amount | $ 41 | $ 33

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