Schedule of Future Minimum Rental Payments for Operating Leases (Details) $ in Millions	Dec. 31, 2015 USD ($)
Minimum Rental Payments
2016	$ 133
2017	119
2018	108
2019	91
2020	54
Thereafter	114
Net minimum lease commitments	619
Minimum Sublease Income
2016	(3)
2017	(1)
2018	(1)
2019	(1)
2020	(1)
Thereafter	(1)
Net minimum lease commitments	(8)
Operating Leases, Net Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	130
2017	118
2018	107
2019	90
2020	53
Thereafter	113
Net minimum lease commitments	$ 611