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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lease, Cost [Abstract]    
Operating lease cost $ 44 $ 87
Amortization of ROU assets 1 1
Variable lease cost 2 4
Total lease cost $ 47 $ 92