Debt, Other Disclosures (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Principal Payments Due on Debt
2017		$ 105
2018		5
2019		755
2020		885
2021		5
Thereafter		6,250
Net unamortized debt issuance costs and other		(79)	$ (66)
Total debt		7,926	7,250
Future Minimum Rentals on Capital Lease Obligations
2017		17
2018		16
2019		16
2020		13
2021		12
Thereafter		31
Less interest expense		(30)
Total capital lease obligations		$ 75	$ 85
Subsequent Event [Member] | Capital Lease Obligations [Member]
Capital Lease Obligations (Textual)
Capital lease obligations incurred	$ 490
Debt instrument, term	10 years
Duration of renewal option	10 years
Subsequent Event [Member] | Assets Held under Capital Leases [Member]
Capital Lease Obligations (Textual)
Property, plant and equipment, additions	$ 490