Earnings Per Share - Narrative (Details) - USD ($)		1 Months Ended		12 Months Ended
	Oct. 17, 2019	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019		Oct. 21, 2020	Sep. 30, 2019	Aug. 31, 2019	Jan. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase program, remaining amount				$ 3,000,000,000
Number of shares repurchased (in shares)				90,000,000	38,000,000		144,000,000
Amount of shares repurchased				$ 2,886,000,000	$ 867,000,000		$ 3,373,000,000
Common stock dividends, per share (in dollars per share)				$ 0.37	$ 0.35	[1]	$ 0.29	[1]
Subsequent Event | Forecast
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Increase in quarterly cash dividend percentage		7.00%
Common stock dividends, per share (in dollars per share)		$ 0.10
January 2019 program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase program authorized amount												$ 5,000,000,000
Number of shares repurchased (in shares)			3,300,000
Accelerated share repurchase program payment			$ 100,000,000		$ 100,000,000						$ 250,000,000
Accelerated share repurchase program initial shares received (in shares)										11,500,000
January 2019 program | Affiliated Entity | MR Argent Advisor LLC
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares repurchased (in shares)	14,100,000
Amount of shares repurchased	$ 319,000,000
October 2020 program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase program authorized amount									$ 5,000,000,000
Structured Share Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares repurchased (in shares)				12,000,000
Amount of shares repurchased				$ 378,000,000
Share repurchase agreement outstanding				0

[1] All prior period share and per share data along with certain other prior period data has been retroactively adjusted to reflect the stock split effective June 28, 2021.