Stock Repurchases (Details) - USD ($) shares in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Repurchased During Period, Shares	1.9
Stock Repurchased During Period, Value	$ 600,000,000
Repurchased shares to satisfy minimum withholding obligations (in shares)		0.1	0.1	0.1
Repurchased shares to satisfy employee withholding tax obligations		$ 22,100,000	$ 17,900,000	$ 24,000,000.0
Authorized amount for share repurchase		4,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 846,000,000
Repurchased shares to satisfy minimum withholding obligations (in shares)		0.1	0.1	0.1
Repurchased shares to satisfy employee withholding tax obligations		$ 22,100,000	$ 17,900,000	$ 24,000,000.0