Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reserve for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 29	$ 27	$ 33
Provision	17	11	37
Other	0	0	(2)
Write-offs/ Disposition	(10)	(9)	(41)
Balance at End of Period	36	29	27
Inventory Reserves (including excess, obsolescence and shrink reserves)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	78	84	75
Provision	68	56	54
Other	2	0	(2)
Write-offs/ Disposition	(66)	(62)	(43)
Balance at End of Period	82	78	84
Income Tax Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	271	195	293
Provision	30	122	14
Other	5	(1)	(27)
Write-offs/ Disposition	(93)	(45)	(85)
Balance at End of Period	$ 213	$ 271	$ 195