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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
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