Schedule of Future Minimum Rental Payments for Operating Leases (Details) $ in Millions	Dec. 31, 2016 USD ($)
Minimum Rental Payments
2017	$ 131
2018	120
2019	103
2020	66
2021	42
Thereafter	119
Net minimum lease commitments	581
Minimum Sublease Income
2017	(2)
2018	(1)
2019	(1)
2020	(2)
2021	(1)
Thereafter	(1)
Net minimum lease commitments	(8)
Operating Leases, Net Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	129
2018	119
2019	102
2020	64
2021	41
Thereafter	118
Net minimum lease commitments	$ 573