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Commitments and Contingencies - Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]    
Operating lease cost $ 39 $ 116
Sublease income (4) (13)
Total lease cost $ 35 $ 103