Receivables (Details) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) agreement	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule Of Financial Receivables [Line Items]
Accounts receivable securitization arrangements | agreement				2
Accounts receivable securitization		$ 325		$ 325		$ 425
Accounts receivable securitization amount drawn		250		250		250
Receivables Sale Program
Schedule Of Financial Receivables [Line Items]
Repurchases of receivables	$ 211
Cash payment for repurchase of receivables	160
Decrease from termination of deferred purchase program receivable	51
Deferred purchase program receivable	0	0		0		12
Net cash funding received during the period				44	$ 153
Amount of cash draws under arrangement during the period				41	189
Amount of cash repayments under arrangement during the period				85	342
Receivables Purchase Agreement
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold	325
Repurchases of receivables	211
Increase in funding of customer receivables sold	$ 200
Accounts receivables sold		398		553
Accounts receivable remaining outstanding		250		250		46
Financing receivables, held as collateral		90		90		$ 33
Customer One
Schedule Of Financial Receivables [Line Items]
Accounts receivables sold		103		267
Accounts receivable remaining outstanding		$ 102		102
Customer Two
Schedule Of Financial Receivables [Line Items]
Accounts receivables sold			$ 42		$ 131
Maximum | Receivables Sale Program
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold				300
Maximum | Receivables Purchase Agreement
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold				$ 125