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Leases Lessee (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Finance Lease Liabilities, Payments, Due [Abstract]  
Finance Lease, Liability, Payments, Due $ 12
Finance Lease, Liability, Payments, Due Year Five 1
Finance Lease, Liability, Payments, Due Year Four 1
Finance Lease, Liability, Payments, Due Year Three 1
Finance Lease, Liability, Payments, Due Year Two 1
Finance Lease, Liability, Payments, Due after Year Five 7
Finance Lease, Liability, Payments, Due Next Twelve Months 1
Operating Lease Liabilities, Payments Due [Abstract]  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 454
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 27
Lessee, Operating Lease, Liability, Payments, Due Year Three 25
Lessee, Operating Lease, Liability, Payments, Due Year Four 26
Lessee, Operating Lease, Liability, Payments, Due Year Two 27
Lessee, Operating Lease, Liability, Payments, Due Year Five 25
Lessee, Operating Lease, Liability, Payments, Due 584
Assets and Liabilities, Lessee [Abstract]  
Lease Liability, Operating and Financing 280
Right-of-use Asset, Operating and Financing 255
Operating Lease, Right-of-Use Asset 251
Finance Lease, Right-of-Use Asset 4
Operating Lease, Liability, Current 22
Operating Lease, Liability, Noncurrent 251
Operating Lease, Liability 273
Finance Lease, Liability, Current 1
Finance Lease, Liability, Noncurrent 6
Finance Lease, Liability $ 7
Lease, Cost [Abstract]  
Operating Lease, Weighted Average Discount Rate, Percent 7.02%
Finance Lease, Weighted Average Discount Rate, Percent 11.97%
Operating Lease, Weighted Average Remaining Lease Term 21 years 8 months 12 days
Finance Lease, Weighted Average Remaining Lease Term 9 years 7 months 6 days
Finance Lease, Cost [Abstract]  
Lease, Cost $ 14
Variable Lease, Cost 1
Operating Lease, Cost 13
Operating Lease Liabilities, Gross Difference, Amount [Abstract]  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (311)
Finance Lease Liabilities, Gross Difference, Amount [Abstract]  
Finance Lease, Liability, Undiscounted Excess Amount (5)
Operating Lease, Payments $ 14
Lessee, Operating Lease, Term of Contract 12 months