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Commitments And Contingencies Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent Expense $ 112 $ 100 $ 85
Operating Leases, Minimum Lease Commitments $ 514