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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.

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