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Leases Supplemental information (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating Lease, Right-of-Use Asset $ 52  
Operating Lease, Liability, Current 8  
Operating Lease, Liability, Noncurrent 44  
Operating Lease, Liability 52  
Finance Lease, Right-of-Use Asset 152  
Finance Lease, Liability, Current 17 $ 0
Finance Lease, Liability Noncurrent 136 $ 0
Finance Lease, Liability $ 153