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Supplemental Equity and Comprehensive Income Information - Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share) | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Common stock, shares authorized (in shares) | 3,000,000,000 |  |  |  | 3,000,000,000 |  |  |  | 3,000,000,000 |  |  |  | 3,000,000,000 | 3,000,000,000 | 3,000,000,000 |  |
Common stock, shares issued (in shares) | 944,033,056 |  |  |  | 944,033,056 |  |  |  | 944,033,056 |  |  |  | 944,033,056 | 944,033,056 | 944,033,056 |  |
Preferred stock, shares authorized (in shares) | 10,000,000 |  |  |  | 10,000,000 |  |  |  | 10,000,000 |  |  |  | 10,000,000 | 10,000,000 | 10,000,000 |  |
Dividends declared in current period (in dollars per share) | $ 1.48 | $ 1.48 | $ 1.48 | $ 1.48 | $ 1.47 | $ 1.47 | $ 1.47 | $ 1.47 | $ 1.44 | $ 1.44 | $ 1.44 | $ 1.44 | $ 5.92 | $ 5.88 | $ 5.76 |  |
Cumulative effect on equity, increase (decrease) | $ 15,117 |  |  |  | $ 12,931 |  |  |  | $ 10,126 |  |  |  | $ 15,117 | $ 12,931 | $ 10,126 |  | $ 9,848
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) | 45,821 |  |  |  | 43,821 |  |  |  | 42,130 |  |  |  | 45,821 | 43,821 | 42,130 |  | 40,684
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) | $ (6,750) |  |  |  | $ (7,721) |  |  |  | $ (8,134) |  |  |  | $ (6,750) | $ (7,721) | $ (8,134) |  | (6,914)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5) |
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5) | (853)
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2018-02 | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 853
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2018-02 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (853)
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2016-02 | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14
Cumulative Effect, Period of Adoption, Adjustment | Impact of adoption of ASU No. 2016-02 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on equity, increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (14)

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