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Leases Lessee (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 37  
Finance Lease, Principal Payments 2  
Operating Lease, Payments 41 $ 48
Finance Lease Liabilities, Gross Difference, Amount [Abstract]    
Finance Lease, Liability, Undiscounted Excess Amount 76  
Operating Lease Liabilities, Gross Difference, Amount [Abstract]    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 335  
Finance Lease, Liability, Payment, Due [Abstract]    
Finance Lease, Liability, Payments, Due Next Twelve Months 5  
Finance Lease, Liability, Payments, Due Year Two 5  
Finance Lease, Liability, Payments, Due Year Three 5  
Finance Lease, Liability, Payments, Due Year Four 4  
Finance Lease, Liability, Payments, Due Year Five 4  
Finance Lease, Liability, Payments, Due after Year Five 134  
Finance Lease, Liability, Payment, Due 157  
Assets and Liabilities, Lessee [Abstract]    
Finance Lease, Right-of-Use Asset 74 67
Operating Lease, Right-of-Use Asset 275 248
Right-of-use Asset, Operating and Financing 349 315
Finance Lease, Liability, Current 4 3
Finance Lease, Liability, Noncurrent 77 67
Finance Lease, Liability 81 70
Lease Liability, Operating and Financing 391 347
Operating Lease, Payments 41 $ 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 29  
Lessee, Operating Lease, Liability, Payments, Due Year Three 28  
Lessee, Operating Lease, Liability, Payments, Due Year Four 27  
Lessee, Operating Lease, Liability, Payments, Due Year Five 25  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 507  
Lessee, Operating Lease, Liability, Payments, Due $ 645  
Lease, Cost [Abstract]    
Finance Lease, Weighted Average Remaining Lease Term 31 years 32 years
Operating Lease, Weighted Average Remaining Lease Term 23 years 23 years
Finance Lease, Weighted Average Discount Rate, Percent 4.11% 4.99%
Operating Lease, Weighted Average Discount Rate, Percent 6.81% 6.99%
Operating Lease, Cost $ 36 $ 46
Finance Lease, Right-of-Use Asset, Amortization 3 2
Finance Lease, Interest Expense 4 2
Short-term Lease, Cost 13 38
Variable Lease, Cost 0 1
Lease, Cost 56 89
Other assets    
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Liability 310 277
Other Current Assets [Member]    
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Liability, Current 17 16
Other Noncurrent Assets [Member]    
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Liability, Noncurrent $ 293 $ 261