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Debt, Other Disclosures (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Principal Payments Due on Debt
2018		$ 106
2019		756
2020		1,266
2021		6
2022		6
Thereafter		6,243
Net unamortized debt issuance costs and other		(73)	$ (79)
Total debt		8,310	7,926
Future Minimum Rentals on Capital Lease Obligations
2018		55
2019		55
2020		53
2021		52
2022		54
Thereafter		969
Total minimum lease payments		1,238
Less amount representing interest		676
Total capital lease obligations		$ 562	$ 75
Capital Lease Obligations [Member]
Capital Lease Obligations (Textual)
Capital lease obligations incurred	$ 490
Debt instrument, term	10 years
Duration of renewal option	10 years
Assets Held under Capital Leases [Member]
Capital Lease Obligations (Textual)
Capital lease assets recognized	$ 490

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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The increase during the period in capital lease obligations due to entering into new capital leases.

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