Debt and Other Financing Arrangements - Accounts Receivable Securitization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Accounts receivable outstanding and derecognized	$ 1,000		$ 1,000
Cash proceeds received for assets derecognized, amount	500		400
Deferred purchase price receivable	69		$ 51
Proceeds from factoring qualifying as sales	1,300	$ 1,200
Proceeds from factoring qualifying as draft amount	1,100	1,100
Interest Expense
Debt Instrument [Line Items]
Loss on sale of receivables	$ 4	$ 6