v3.6.0.2
Debt (Capital Lease Obligations) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]  
Minimum Lease Payments, Sale Leaseback Transactions, within One Year $ 17 [1]
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years 21 [1]
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years 21 [1]
Minimum Lease Payments, Sale Leaseback Transactions, within Four Years 21 [1]
Minimum Lease Payments, Sale Leaseback Transactions, within Five Years 21 [1]
Minimum Lease Payments, Sale Leaseback Transactions, Thereafter 42 [1]
Minimum Lease Payments, Sale Leaseback Transactions 143 [1]
Interest Portion of Minimum Lease Payments, Sale Leaseback Transactions 52 [1]
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions 91 [1]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
Capital Leases, Future Minimum Payments Due, Current 40
Capital Leases, Future Minimum Payments Due in Two Years 40
Capital Leases, Future Minimum Payments Due in Three Years 21
Capital Leases, Future Minimum Payments Due in Four Years 19
Capital Leases, Future Minimum Payments Due in Five Years 19
Capital Leases, Future Minimum Payments Due Thereafter 117
Capital Leases, Future Minimum Payments Due 256
Capital Leases, Future Minimum Payments, Interest Included in Payments 94
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments 162
Total Leases Future Minimum Payments [Abstract]  
Total Leases, Future Minimum Payments Due, Current 57
Total Leases, Future Minimum Payments Due in Two Years 61
Total Leases, Future Minimum Payments Due in Three Years 42
Total Leases, Future Minimum Payments Due in Four Years 40
Total Leases, Future Minimum Payments Due in Five Years 40
Total Leases, Future Minimum Payments Due Thereafter 159
Total Leases, Future Minimum Payments Due 399
Total Leases, Future Minimum Payments, Interest Included in Payments 146
Total Leases, Future Minimum Payments, Present Value of Net Minimum Payments $ 253
[1] Amounts are accounted for as financing transactions under U.S. GAAP and are included in our project financing, notes payable and other amounts above.