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Derivative Instruments - Offsetting Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Other current assets    
Offsetting Liabilities [Line Items]    
Cash collateral posted $ 163 $ 340
Other current liabilities    
Offsetting Liabilities [Line Items]    
Cash collateral received $ 9 $ 1