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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease, Cost [Abstract]    
Operating lease cost $ 45 $ 133
Amortization of ROU assets 1 1
Variable lease cost 2 6
Total lease cost $ 48 $ 140