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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Contract assets included in prepaid and other current assets $ 32 $ 30
Contract liabilities included in accrued liabilities (4) (5)
Net contract asset 28 $ 25
Revenue recognized related to contract liabilities $ 1