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Summary of Significant Accounting Policies - Consolidated Statements of Shareholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2016 | Dec. 31, 2015
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | $ 22,551 | $ 20,569 |  |  |
Net income | 2,160 | 3,554 | $ 1,808 |  |
Unrealized net capital gains and losses | (754) | 319 | 433 |  |
Unrealized foreign currency translation adjustments | (48) | 45 | 9 |  |
Unamortized pension and other postretirement prior service credit | (59) | (52) | (33) |  |
Balance, end of year | 21,312 | 22,551 | 20,569 |  |
Retained income |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | 41,579 | 39,009 | 37,813 |  |
Cumulative effect of change in accounting principle |  | 1,088 | 0 | $ 1,600 | $ 0
Net income | 2,160 | 3,554 | 1,808 |  |
Dividends on common stock | (646) | (540) | (496) |  |
Dividends on preferred stock | (148) | (116) | (116) |  |
Reclassification of tax effects due to change in accounting principle | 0 | (328) | 0 |  |
Balance, end of year | 44,033 | 41,579 | 39,009 |  |
Accumulated other comprehensive income (loss) |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | 1,889 | 1,249 | 840 |  |
Cumulative effect of change in accounting principle |  | (910) | 0 |  | $ 0
Unrealized net capital gains and losses | (754) | 319 | 433 |  |
Unrealized foreign currency translation adjustments | (48) | 45 | 9 |  |
Unamortized pension and other postretirement prior service credit | (59) | (52) | (33) |  |
Reclassification of tax effects due to change in accounting principle | 0 | 328 | 0 |  |
Balance, end of year | 118 | 1,889 | 1,249 |  |
Previously reported |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year |  | 20,573 |  |  |
Net income | 2,252 | 3,189 | 1,877 |  |
Unrealized net capital gains and losses | (754) | 319 | 433 |  |
Unrealized foreign currency translation adjustments | (55) | 47 | 10 |  |
Unamortized pension and other postretirement prior service credit | (144) | 307 | (104) |  |
Balance, end of year |  |  | 20,573 |  |
Previously reported | Retained income |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | 43,162 | 40,678 | 39,413 |  |
Cumulative effect of change in accounting principle |  | 1,088 |  |  |
Net income | 2,252 | 3,189 | 1,877 |  |
Dividends on common stock | (646) | (540) | (496) |  |
Dividends on preferred stock | (148) | (116) | (116) |  |
Reclassification of tax effects due to change in accounting principle |  | (49) |  |  |
Balance, end of year | 45,708 | 43,162 | 40,678 |  |
Previously reported | Accumulated other comprehensive income (loss) |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | 306 | (416) | (755) |  |
Cumulative effect of change in accounting principle |  | (910) |  |  |
Unrealized net capital gains and losses | (754) | 319 | 433 |  |
Unrealized foreign currency translation adjustments | (55) | 47 | 10 |  |
Unamortized pension and other postretirement prior service credit | (144) | 307 | (104) |  |
Reclassification of tax effects due to change in accounting principle |  | 49 |  |  |
Balance, end of year | (1,557) | 306 | (416) |  |
Impact of change | Restatement Adjustment |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year |  | (4) |  |  |
Net income | (92) | 365 | (69) |  |
Unrealized net capital gains and losses | 0 | 0 | 0 |  |
Unrealized foreign currency translation adjustments | 7 | (2) | (1) |  |
Unamortized pension and other postretirement prior service credit | 85 | (359) | 71 |  |
Balance, end of year |  |  | (4) |  |
Impact of change | Restatement Adjustment | Retained income |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | (1,583) | (1,669) | (1,600) |  |
Cumulative effect of change in accounting principle |  | 0 |  |  |
Net income | (92) | 365 | (69) |  |
Dividends on common stock | 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 | (1,675) | (1,583) | (1,669) |  |
Impact of change | Restatement Adjustment | Accumulated other comprehensive income (loss) |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |
Balance, beginning of year | 1,583 | 1,665 | 1,595 |  |
Cumulative effect of change in accounting principle |  | 0 |  |  |
Unrealized net capital gains and losses | 0 | 0 | 0 |  |
Unrealized foreign currency translation adjustments | 7 | (2) | (1) |  |
Unamortized pension and other postretirement prior service credit | 85 | (359) | 71 |  |
Reclassification of tax effects due to change in accounting principle |  | 279 |  |  |
Balance, end of year | $ 1,675 | $ 1,583 | $ 1,665 |  |

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