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Commitments and Contingent Liabilities Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 122    
Operating Leases, Future Minimum Payments, Due in Two Years 107    
Operating Leases, Future Minimum Payments, Due in Three Years 102    
Operating Leases, Future Minimum Payments, Due in Four Years 97    
Operating Leases, Future Minimum Payments, Due in Five Years 81    
Operating Leases, Future Minimum Payments, Due Thereafter 353    
Operating Leases, Future Minimum Payments Due 862    
Operating Leases, Rent Expense $ 155 $ 140 $ 138
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 35 years