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Investments - Sales of Available for Sale Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 19,534 | $ 18,499 | $ 24,700
Available-for-sale Securities, Gross Realized Gains | 255 | 234 | 114
Available-for-sale Securities, Gross Realized Losses | (50) | (56) | (172)
Fixed maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 15,059 | 14,421 | 21,327
Available-for-sale Securities, Gross Realized Gains | 254 | 233 | 90
Available-for-sale Securities, Gross Realized Losses | $ (50) | $ (56) | $ (169)

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