Investments, Investment Income and Gains and Losses - Equity Securities (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Investments [Abstract] | ||
Fair equity securities that have a readily determinable fair value | $ 415 | |
Amortized cost of equity securities that have a readily determinable fair value | 433 | |
Carrying value of private equity securities that do not have a readily determinable fair value | $ 89 | |
Impairment or value changes of equity securities without a readily determinable fair value | ||
Fair equity securities that have a readily determinable fair value, including disposal groups | 64 | |
Amortized cost of equity securities that have a readily determinable fair value, including disposal groups | 61 | |
Carrying value of private equity securities that do not have a readily determinable fair value, including disposal groups | $ 192 |