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Leases (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Leases [Abstract]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 232
Operating Leases, Future Minimum Payments, Due in Two Years 189
Operating Leases, Future Minimum Payments, Due in Three Years 137
Operating Leases, Future Minimum Payments, Due in Four Years 93
Operating Leases, Future Minimum Payments, Due in Five Years 63
Thereafter 192
Total minimum lease payments $ 906