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Summary of Significant Accounting Policies - Consolidated Statements of Shareholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | $ 21,312 | $ 22,551 |  |  |  |
Net income | 4,847 | 2,160 | $ 3,554 |  |  |
Unrealized net capital gains and losses | 1,889 | (754) | 319 |  |  |
Unrealized foreign currency translation adjustments | (10) | (48) | 45 |  |  |
Change in unamortized pension and other postretirement prior service credit | (47) | (59) | (52) |  |  |
Balance, end of year | 25,998 | 21,312 | 22,551 |  |  |
Retained income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 44,033 | 41,579 | 39,009 |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 21 | $ 1,088 | $ 0
Net income | 4,847 | 2,160 | 3,554 |  |  |
Dividends, Common Stock, Cash | (658) | (646) | (540) |  |  |
Dividends on preferred stock | (169) | (148) | (116) |  |  |
Reclassification of tax effects due to change in accounting principle | 0 | 0 | (328) |  |  |
Balance, end of year | 48,074 | 44,033 | 41,579 |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 118 | 1,889 | 1,249 |  |  |
Cumulative effect of change in accounting principle |  |  | (910) | 0 | (910) | $ 0
Unrealized net capital gains and losses | 1,889 | (754) | 319 |  |  |
Unrealized foreign currency translation adjustments | (10) | (48) | 45 |  |  |
Change in unamortized pension and other postretirement prior service credit | (47) | (59) | (52) |  |  |
Reclassification of tax effects due to change in accounting principle | 0 | 0 | 328 |  |  |
Balance, end of year | 1,950 | 118 | 1,889 |  |  |
Previously reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 21,312 |  |  |  |  |
Net income | 4,811 | 2,252 | 3,189 |  |  |
Unrealized net capital gains and losses | 1,889 | (754) | 319 |  |  |
Unrealized foreign currency translation adjustments | (4) | (55) | 47 |  |  |
Change in unamortized pension and other postretirement prior service credit | 141 | (144) | 307 |  |  |
Balance, end of year | 26,156 | 21,312 |  |  |  |
Previously reported | Retained income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 45,708 | 43,162 | 40,678 |  |  |
Cumulative effect of change in accounting principle |  |  |  | 21 | 1,088 |
Net income | 4,811 | 2,252 | 3,189 |  |  |
Dividends, Common Stock, Cash | (658) | (646) | (540) |  |  |
Dividends on preferred stock | (169) | (148) | (116) |  |  |
Reclassification of tax effects due to change in accounting principle |  |  | (49) |  |  |
Balance, end of year | 49,713 | 45,708 | 43,162 |  |  |
Previously reported | Accumulated other comprehensive income (loss) |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | (1,557) | 306 | (416) |  |  |
Cumulative effect of change in accounting principle |  |  |  | 0 | (910) |
Unrealized net capital gains and losses | 1,889 | (754) | 319 |  |  |
Unrealized foreign currency translation adjustments | (4) | (55) | 47 |  |  |
Change in unamortized pension and other postretirement prior service credit | 141 | (144) | 307 |  |  |
Reclassification of tax effects due to change in accounting principle |  |  | 49 |  |  |
Balance, end of year | 469 | (1,557) | 306 |  |  |
Impact of change | Impact of change |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 0 |  |  |  |  |
Net income | 36 | (92) | 365 |  |  |
Unrealized net capital gains and losses | 0 | 0 | 0 |  |  |
Unrealized foreign currency translation adjustments | (6) | 7 | (2) |  |  |
Change in unamortized pension and other postretirement prior service credit | (188) | 85 | (359) |  |  |
Balance, end of year | (158) | 0 |  |  |  |
Impact of change | Impact of change | Retained income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | (1,675) | (1,583) | (1,669) |  |  |
Cumulative effect of change in accounting principle |  |  |  | 0 | 0 |
Net income | 36 | (92) | 365 |  |  |
Dividends, Common Stock, Cash | 0 | 0 | 0 |  |  |
Dividends on preferred stock | 0 | 0 | 0 |  |  |
Reclassification of tax effects due to change in accounting principle |  |  | (279) |  |  |
Balance, end of year | (1,639) | (1,675) | (1,583) |  |  |
Impact of change | Impact of change | Accumulated other comprehensive income (loss) |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Balance, beginning of year | 1,675 | 1,583 | 1,665 |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 0 | $ 0 |
Unrealized net capital gains and losses | 0 | 0 | 0 |  |  |
Unrealized foreign currency translation adjustments | (6) | 7 | (2) |  |  |
Change in unamortized pension and other postretirement prior service credit | (188) | 85 | (359) |  |  |
Reclassification of tax effects due to change in accounting principle |  |  | 279 |  |  |
Balance, end of year | $ 1,481 | $ 1,675 | $ 1,583 |  |  |

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