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Debt Debt (Accounts Receivable Securitization Facility) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 06, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized   $ 201 $ 257
Accounts Receivable Securitization Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit, Current [1]   0 $ 115
Secured Debt [Member] | Accounts Receivable Securitization Facility [Member]      
Debt Instrument [Line Items]      
Repayments of Lines of Credit $ 87    
Secured Debt [Member] | Amended Restated Receivable Securitization Facility [Member]      
Debt Instrument [Line Items]      
PercentageOfFairValueOfSalesReceivables 100.00%    
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized $ 87 595  
Trade Receivables Pledged As Collateral   $ 51  
[1] The weighted average interest rate was 0.0% and 2.4% as of December 31, 2020 and 2019, respectively.