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Earnings Per Share - Narrative (Details) - USD ($) | Feb. 10, 2021 | Mar. 31, 2021 | Oct. 21, 2020 | Jan. 31, 2019
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Remaining share repurchase authority amount |  | $ 5,300,000,000 |  |
Increase in quarterly dividend percentage | 8.00% |  |  |
Common stock dividends, per share (in dollars per share) | $ 0.28 |  |  |
January 2019 program |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Authorized share repurchase program amount |  |  |  | $ 5,000,000,000
Remaining share repurchase authority amount |  | $ 339,000,000 |  |
October 2020 program |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Authorized share repurchase program amount |  |  | $ 5,000,000,000 |

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