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Leases (Components of Lease Cost and Rent Expense) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 48
Short-term rent expense 30
Variable lease cost 3
Sublease Income (1)
Total operating lease cost 80
Finance lease cost:  
Amortization of right-of-use assets 3
Interest on finance lease liabilities 2
Total finance lease cost $ 5