Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Nov. 02, 2021	May 04, 2021	Nov. 04, 2020	Feb. 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program, open market	21
Share repurchase program, open market, average price per share	$ 61.52
Share repurchase program, remaining authorized repurchase amount	$ 500
2020 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 200
2020 Share Repurchase Program Expansion
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount				$ 300
First 2021 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount			$ 1,000
Second 2021 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount		$ 500