Additional Information (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Discounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 0	$ 0	$ 0
Charged to costs and expenses	647	633	604
Deductions	(647)	(633)	(604)
Balance at end of year	0	0	0
Returned Goods [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	40	32	32
Charged to costs and expenses	124	98	127
Deductions	(114)	(90)	(127)
Balance at end of year	$ 50	$ 40	$ 32