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Summary of Significant Accounting Policies - Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
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)
Other comprehensive income (loss), after-tax | 1,832 | (861) | 312
Comprehensive income | 6,679 | 1,299 | 3,866
Previously reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
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
Other comprehensive income (loss), after-tax | 2,026 | (953) | 673
Comprehensive income | 6,837 | 1,299 | 3,862
Impact of change | Impact of change |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
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)
Other comprehensive income (loss), after-tax | (194) | 92 | (361)
Comprehensive income | $ (158) | $ 0 | $ 4

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