Stockholders' Equity - Changes in Common Shares and Treasury Stock (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Class of Stock [Line Items]
Common stock, shares authorized	6,000,000,000	6,000,000,000
Preferred stock, authorized (in shares)	1,000,000,000	1,000,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	501,891,243	501,900,000	501,900,000
Beginning Balance	26,573,492	26,400,000	22,300,000
Stock-based compensation		0	0
Share repurchase program		0	0
Treasury Stock	(1,300,000)	(1,600,000)	(1,800,000)
Ending Balance	501,891,243	501,891,243	501,900,000
Ending Balance	29,317,153	26,573,492	26,400,000
December 2016 Share Repurchase Program
Class of Stock [Line Items]
Shares authorized under repurchase program					$ 1,500,000,000
December 2018 Share Repurchase Program
Class of Stock [Line Items]
Shares authorized under repurchase program				$ 2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 681,000,000
December 2021 Share Repurchase Program [Member]
Class of Stock [Line Items]
Shares authorized under repurchase program	$ 3,500,000,000
Share Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock	(4,000,000.0)	(1,800,000)	(5,800,000)