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Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | $ 54,685 | $ 52,948 | $ 54,041 | $ 49,343
Other comprehensive income (loss), net of tax | (384) | (72) | (1,691) | 2,198
Equity, Ending Balance | 56,297 | 53,310 | 56,297 | 53,310
Continuing Operations |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), net of tax | (384) | (72) | (1,691) | 2,083
Discontinued Operations |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  | 115
Debt securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | 1,584 | 2,621 | 2,462 | 1,067
Other comprehensive income (loss), net of tax | (246) | 8 | (1,124) | 1,562
Equity, Ending Balance | 1,338 | 2,629 | 1,338 | 2,629
Cash flow hedge derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | 236 | 890 | 659 | 276
Other comprehensive income (loss), net of tax | (133) | (92) | (556) | 522
Equity, Ending Balance | 103 | 798 | 103 | 798
Pension and other postretirement benefit plan adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | (355) | (412) | (345) | (408)
Other comprehensive income (loss), net of tax | 2 | 2 | (8) | (2)
Equity, Ending Balance | (353) | (410) | (353) | (410)
Other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | (2) | (30) | (6) | (21)
Other comprehensive income (loss), net of tax | (7) | 10 | (3) | 1
Equity, Ending Balance | (9) | (20) | (9) | (20)
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | 1,463 | 3,069 | 2,770 | 799
Other comprehensive income (loss), net of tax | (384) | (72) | (1,691) | 2,198
Equity, Ending Balance | 1,079 | 2,997 | 1,079 | 2,997
Total | Continuing Operations |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance | 1,463 | 3,069 | 2,770 | 914
Other comprehensive income (loss), net of tax | (384) | (72) | (1,691) | 2,083
Equity, Ending Balance | 1,079 | 2,997 | 1,079 | 2,997
Total | Discontinued Operations |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Equity, Beginning Balance |  |  |  | (115)
Other comprehensive income (loss), net of tax |  |  |  | 115
Equity, Ending Balance |  |  |  |

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