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Earnings Per Share - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | [1] | Jun. 30, 2021 | Jun. 30, 2020 | Oct. 21, 2020 | Jan. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining share repurchase authority amount |  | $ 4,600,000,000 |  |  |  |  | $ 4,600,000,000 |  |  |
Payments for shares repurchased |  | $ 701,000,000 |  | $ 39,000,000 |  |  | $ 1,252,000,000 | $ 616,000,000 |  |
Shares received (in shares) |  | 22,000,000 |  | 2,000,000 |  |  | 40,000,000 | 29,000,000 |  |
Increase in quarterly dividend percentage | 8.00% |  |  |  |  |  |  |  |  |
Common stock dividends (in dollars per share) |  | $ 0.093 | $ 0.093 | $ 0.087 | [1] | $ 0.087 | $ 0.093 |  |  |
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 |  | $ 228,000,000 |  |  |  |  |  |  |  |
Shares received (in shares) |  | 7,000,000 |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 0 |  |  |  |  | 0 |  |  |
[1] | All prior period share and per share data has been retroactively adjusted to reflect the stock split effective June 28, 2021.

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