Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	May 05, 2022	Feb. 28, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Class of Stock [Line Items]
Cash dividends, per share (in dollars per share)		$ 0.15	$ 0.56	$ 0.10	$ 0.125
Variable dividend payable (in dollars per share)		0.41
Dividend payable (in dollars per share)		$ 0.56
Stock repurchase program, authorized amount		$ 1,250
Stock repurchased during period (in shares)			8,000,000
Share repurchases			$ 192		$ 8
Treasury stock (in shares)			86,710,998		79,082,385
Stock repurchase program			$ 1,100
Subsequent event
Class of Stock [Line Items]
Cash dividends, per share (in dollars per share)	$ 0.15
Variable dividend payable (in dollars per share)	0.45
Dividend payable (in dollars per share)	$ 0.60