Additional Information (Schedule of Rental Commitments and Sublease Income Under Non-Cancelable Operating Leases) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Rental Commitments
2017	$ 52
2018	46
2019	35
2020	30
2021	24
Thereafter	72
Total	259
Sublease Income
2017	5
2018	5
2019	5
2020	6
2021	6
Thereafter	15
Total	$ 42