v3.6.0.2
Commitments and Contingencies (Schedules of Future Minimum Rental Payments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Land and Other Operating Leases [Member]  
Operating Leased Assets [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 13
Operating Leases, Future Minimum Payments, Due in Two Years 13
Operating Leases, Future Minimum Payments, Due in Three Years 13
Operating Leases, Future Minimum Payments, Due in Four Years 12
Operating Leases, Future Minimum Payments, Due in Five Years 12
Operating Leases, Future Minimum Payments, Due Thereafter 176
Operating Leases, Future Minimum Payments Due 239
KIAC [Member]  
Operating Leased Assets [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 22
Operating Leases, Future Minimum Payments, Due in Two Years 22
Operating Leases, Future Minimum Payments, Due in Three Years 30
Operating Leases, Future Minimum Payments, Due in Four Years 0
Operating Leases, Future Minimum Payments, Due in Five Years 0
Operating Leases, Future Minimum Payments, Due Thereafter 0
Operating Leases, Future Minimum Payments Due 74
Operting Lease Assets Total [Member]  
Operating Leased Assets [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 35
Operating Leases, Future Minimum Payments, Due in Two Years 35
Operating Leases, Future Minimum Payments, Due in Three Years 43
Operating Leases, Future Minimum Payments, Due in Four Years 12
Operating Leases, Future Minimum Payments, Due in Five Years 12
Operating Leases, Future Minimum Payments, Due Thereafter 176
Operating Leases, Future Minimum Payments Due 313
Natural Gas [Member]  
Operating Leased Assets [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 285
Operating Leases, Future Minimum Payments, Due in Two Years 201
Operating Leases, Future Minimum Payments, Due in Three Years 118
Operating Leases, Future Minimum Payments, Due in Four Years 89
Operating Leases, Future Minimum Payments, Due in Five Years 70
Operating Leases, Future Minimum Payments, Due Thereafter 539
Operating Leases, Future Minimum Payments Due $ 1,302