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Leases (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease, Right-of-Use Asset $ 761 $ 912
Operating Lease, Liability, Current (91) (128)
Operating Lease, Liability, Noncurrent 709 690
Finance Lease, Liability $ 83 $ 89