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Leases (Components of Lease Cost and Rent Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 48 $ 95
Short-term rent expense 27 59
Variable lease cost 7 10
Sublease Income (1) (2)
Total operating lease cost 81 162
Finance lease cost:    
Amortization of right-of-use assets 3 6
Interest on finance lease liabilities 2 4
Total finance lease cost $ 5 $ 10