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Commitments and Contingent Liabilities Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 118    
Operating Leases, Future Minimum Payments, Due in Two Years 106    
Operating Leases, Future Minimum Payments, Due in Three Years 81    
Operating Leases, Future Minimum Payments, Due in Four Years 62    
Operating Leases, Future Minimum Payments, Due in Five Years 55    
Operating Leases, Future Minimum Payments, Due Thereafter 300    
Operating Leases, Future Minimum Payments Due 722    
Operating Leases, Rent Expense $ 140 $ 138 $ 143
Minimum [Member]      
Operating Leased Assets [Line Items]      
Lessee, Operating Lease, Term of Contract 1 year    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Lessee, Operating Lease, Term of Contract 41 years