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Commitments and Contingent Liabilities Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 106    
Operating Leases, Future Minimum Payments, Due in Two Years 94    
Operating Leases, Future Minimum Payments, Due in Three Years 86    
Operating Leases, Future Minimum Payments, Due in Four Years 75    
Operating Leases, Future Minimum Payments, Due in Five Years 61    
Operating Leases, Future Minimum Payments, Due Thereafter 342    
Operating Leases, Future Minimum Payments Due 764    
Operating Leases, Rent Expense $ 138 $ 143 $ 114
Minimum [Member]      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 41 years