Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Investments in Unrealized Loss Position (Details)

v3.20.2
Fair Value Measurements - Investments in Unrealized Loss Position (Details) - Debt Securities - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 63 $ 178 $ 75 $ 170
Purchases of investments 1 8 18 15
Principal payments on investments (1) (1) (2) (2)
Sale of investments (19) (65) (53) (65)
Realized gains on investments recorded in gain on sale of receivables and investments 2 0 5 0
Unrealized gains (losses) on investments recorded in OCI 0 4 3 6
Balance, end of period $ 46 $ 124 $ 46 $ 124