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Earnings Per Share - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2021 $ / shares | Jun. 04, 2021 | Mar. 31, 2021 | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 $ / shares | [1] | Mar. 31, 2020 $ / shares | [1] | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares | Oct. 21, 2020 USD ($) | Jan. 31, 2019 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining share repurchase authority amount |  |  |  | $ 3,600,000,000 | $ 3,600,000,000 |  |  |  |  |  |  | $ 3,600,000,000 |  |  |
Payments for shares repurchased |  |  |  |  | $ 1,064,000,000 |  |  | $ 48,000,000 |  |  |  | $ 2,316,000,000 | $ 664,000,000 |  |
Shares received (in shares) | shares |  |  |  |  | 34,000,000 |  |  | 2,000,000 |  |  |  | 74,000,000 | 31,000,000 |  |
Increase in quarterly dividend percentage |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends (in dollars per share) | $ / shares | $ 0.28 |  |  | $ 0.093 | $ 0.093 | $ 0.093 | $ 0.093 | $ 0.087 | [1] | $ 0.087 | $ 0.087 |  |  |  |
Stock split conversion ratio | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
January 2019 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share repurchase program amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000
October 2020 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share repurchase program amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000 |
Structured Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for shares repurchased |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  | $ 378,000,000 |  |  |
Shares received (in shares) | shares |  |  |  |  | 5,000,000 |  |  |  |  |  |  | 12,000,000 |  |  |
Shares outstanding (in shares) | shares |  |  |  | 0 | 0 |  |  |  |  |  |  | 0 |  |  |
[1] | All prior period share and per share data has been retroactively adjusted to reflect the stock split effective June 28, 2021. Certain prior year data has been reclassified to conform to the current presentation.

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