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General - Statement of Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 01, 2019 | Jan. 01, 2019 | Apr. 01, 2018 | Jan. 01, 2018
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period |  |  | $ 21,312 |  |  |  |  |
Net income | $ 851 | $ 717 | 2,143 | $ 1,723 |  |  |  |
Unrealized net capital gains and losses | 682 | (133) | 1,656 | (698) |  |  |  |
Unrealized foreign currency translation adjustments | 4 | (6) | 9 | (8) |  |  |  |
Change in unamortized pension and other postretirement prior service credit | (11) | (16) | (23) | (30) |  |  |  |
Balance, end of period | 24,476 | 23,122 | 24,476 | 23,122 |  |  |  |
Retained income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | 45,148 | 43,479 | 44,033 | 41,579 |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 0 | $ 21 | $ 0 | $ 1,088
Net income | 851 | 717 | 2,143 | 1,723 |  |  |  |
Dividends on common stock | (166) | (160) | (333) | (325) |  |  |  |
Dividends on preferred stock | (30) | (39) | (61) | (68) |  |  |  |
Balance, end of period | 45,803 | 43,997 | 45,803 | 43,997 |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | 1,085 | 398 | 118 | 1,889 |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 | 0 | $ 0 | (910)
Unrealized net capital gains and losses | 682 | (133) | 1,656 | (698) |  |  |  |
Unrealized foreign currency translation adjustments | 4 | (6) | 9 | (8) |  |  |  |
Change in unamortized pension and other postretirement prior service credit | (11) | (16) | (23) | (30) |  |  |  |
Balance, end of period | 1,760 | 243 | 1,760 | 243 |  |  |  |
Previously reported |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Net income | 920 | 676 | 2,207 | 1,651 |  |  |  |
Unrealized net capital gains and losses | 682 | (133) | 1,656 | (698) |  |  |  |
Unrealized foreign currency translation adjustments | 7 | (7) | 14 | (11) |  |  |  |
Change in unamortized pension and other postretirement prior service credit | 125 | 22 | 135 | 45 |  |  |  |
Balance, end of period | 24,703 | 23,122 | 24,703 | 23,122 |  |  |  |
Previously reported | Retained income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | 46,818 | 45,031 | 45,708 | 43,162 |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 | 21 |  | 1,088
Net income | 920 | 676 | 2,207 | 1,651 |  |  |  |
Dividends on common stock | (166) | (160) | (333) | (325) |  |  |  |
Dividends on preferred stock | (30) | (39) | (61) | (68) |  |  |  |
Balance, end of period | 47,542 | 45,508 | 47,542 | 45,508 |  |  |  |
Previously reported | Accumulated other comprehensive income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | (566) | (1,150) | (1,557) | 306 |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 | 0 |  | (910)
Unrealized net capital gains and losses | 682 | (133) | 1,656 | (698) |  |  |  |
Unrealized foreign currency translation adjustments | 7 | (7) | 14 | (11) |  |  |  |
Change in unamortized pension and other postretirement prior service credit | 125 | 22 | 135 | 45 |  |  |  |
Balance, end of period | 248 | (1,268) | 248 | (1,268) |  |  |  |
Impact of change | Impact of change |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Net income | (69) | 41 | (64) | 72 |  |  |  |
Unrealized net capital gains and losses | 0 | 0 | 0 | 0 |  |  |  |
Unrealized foreign currency translation adjustments | (3) | 1 | (5) | 3 |  |  |  |
Change in unamortized pension and other postretirement prior service credit | (136) | (38) | (158) | (75) |  |  |  |
Balance, end of period | (227) | 0 | (227) | 0 |  |  |  |
Impact of change | Impact of change | Retained income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | (1,670) | (1,552) | (1,675) | (1,583) |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 | 0 |  | 0
Net income | (69) | 41 | (64) | 72 |  |  |  |
Dividends on common stock | 0 | 0 | 0 | 0 |  |  |  |
Dividends on preferred stock | 0 | 0 | 0 | 0 |  |  |  |
Balance, end of period | (1,739) | (1,511) | (1,739) | (1,511) |  |  |  |
Impact of change | Impact of change | Accumulated other comprehensive income |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  |  |  |  |  |  |
Balance, beginning of period | 1,651 | 1,548 | 1,675 | 1,583 |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 0 | $ 0 |  | $ 0
Unrealized net capital gains and losses | 0 | 0 | 0 | 0 |  |  |  |
Unrealized foreign currency translation adjustments | (3) | 1 | (5) | 3 |  |  |  |
Change in unamortized pension and other postretirement prior service credit | (136) | (38) | (158) | (75) |  |  |  |
Balance, end of period | $ 1,512 | $ 1,511 | $ 1,512 | $ 1,511 |  |  |  |

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