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Fair Value Measurements - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Proceeds from the sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income        
Sale proceeds $ 26 $ 149 $ 39 $ 302
Realized gains 0 5 4 12
Realized Losses (2) (5) (7) (11)
Interest and dividend income $ 9 $ 11 $ 14 $ 20