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Leases (Summary of Operating Lease Rental Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases, Rent Expense, Net [Abstract]      
Minimum rentals $ 641 $ 641 $ 570
Contingent rentals 6 6 8
Less: sublease rental income 95 136 135
Total $ 552 $ 511 $ 443