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Fair Value Measurements - Reconciliation of Fair Value Measurements that Use Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value Disclosures [Abstract]        
Contingent payments, Fair value as of beginning of period $ 39 $ 31 $ 39 $ 32
Contingent payments, additions 0 0 4 0
Contingent payments, change in fair value recognized in earnings 0 (4) (3) (4)
Contingent payments, payments 0 0 (1) (1)
Contingent payments, Fair value as of end of period $ 39 $ 27 $ 39 $ 27