Additional Information (Schedule of Rental Commitments and Sublease Income Under Non-Cancelable Operating Leases) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Rental Commitments
2016	$ 58
2017	52
2018	45
2019	32
2020	28
Thereafter	94
Total	309
Sublease Income
2016	6
2017	5
2018	5
2019	5
2020	5
Thereafter	23
Total	$ 49