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Revenue (Contracts with Customer Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Contract assets included in prepaid and other current assets $ 37 $ 30
Contract liabilities included in accrued liabilities 0 (5)
Net contract assets $ 37 $ 25