v3.3.1.900
Commitments And Contingencies Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Rent Expense $ 95 $ 105 $ 99
Operating Leases, Minimum Lease Commitments $ 328