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Leases Lessee (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Finance Lease Liabilities, Gross Difference, Amount [Abstract]  
Finance Lease, Liability, Undiscounted Excess Amount $ 69
Operating Lease Liabilities, Gross Difference, Amount [Abstract]  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 318
Finance Lease, Liability, Payment, Due [Abstract]  
Finance Lease, Liability, Payments, Due Next Twelve Months 4
Finance Lease, Liability, Payments, Due Year Two 4
Finance Lease, Liability, Payments, Due Year Three 4
Finance Lease, Liability, Payments, Due Year Four 4
Finance Lease, Liability, Payments, Due Year Five 4
Finance Lease, Liability, Payments, Due after Year Five 119
Finance Lease, Liability, Payment, Due 139
Assets and Liabilities, Lessee [Abstract]  
Finance Lease, Right-of-Use Asset 67
Operating Lease, Right-of-Use Asset 248
Right-of-use Asset, Operating and Financing 315
Finance Lease, Liability, Current 3
Finance Lease, Liability, Noncurrent 67
Finance Lease, Liability 70
Operating Lease, Liability, Current 16
Operating Lease, Liability, Noncurrent 261
Operating Lease, Liability 277
Lease Liability, Operating and Financing 347
Operating Lease, Payments 48
Lessee, Operating Lease, Liability, Payment, Due [Abstract]  
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 29
Lessee, Operating Lease, Liability, Payments, Due Year Two 27
Lessee, Operating Lease, Liability, Payments, Due Year Three 27
Lessee, Operating Lease, Liability, Payments, Due Year Four 26
Lessee, Operating Lease, Liability, Payments, Due Year Five 26
Lessee, Operating Lease, Liability, Payments, Due after Year Five 460
Lessee, Operating Lease, Liability, Payments, Due $ 595
Lease, Cost [Abstract]  
Finance Lease, Weighted Average Remaining Lease Term 32 years
Operating Lease, Weighted Average Remaining Lease Term 23 years
Finance Lease, Weighted Average Discount Rate, Percent 4.99%
Operating Lease, Weighted Average Discount Rate, Percent 6.99%
Operating Lease, Cost $ 46
Finance Lease, Right-of-Use Asset, Amortization 2
Finance Lease, Interest Expense 2
Short-term Lease, Cost 38
Variable Lease, Cost 1
Lease, Cost $ 89