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Investments - Sales of Available for Sale Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale proceeds | $ 24,700 | $ 31,646 | $ 24,486
Gross gains | 114 | 275 | 222
Gross losses | (172) | (113) | (159)
Fixed maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale proceeds | 21,327 | 17,614 | 9,984
Gross gains | 90 | 204 | 196
Gross losses | $ (169) | (90) | (138)
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale proceeds |  | 607 | 359
Gross gains |  | 69 | 26
Gross losses |  | $ (23) | $ (20)

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