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Leases (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Lessee, Operating Lease, Term of Contract 108 years
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 27
Operating Lease, Cost 10
Short-term Lease, Cost 0
Variable Lease, Cost 6
Sublease Income (1)
Lease, Cost 15
Operating Lease, Payments 9
Operating Lease, Right-of-Use Asset 223
Operating Lease, Liability, Current 25
Operating Lease, Liability, Noncurrent $ 198
Operating Lease, Weighted Average Remaining Lease Term 12 years
Operating Lease, Weighted Average Discount Rate, Percent 4.62%
Lessee, Operating Lease, Liability, Payments, Due Year Two $ 32
Lessee, Operating Lease, Liability, Payments, Due Year Three 32
Lessee, Operating Lease, Liability, Payments, Due Year Four 27
Lessee, Operating Lease, Liability, Payments, Due Year Five 19
Lessee, Operating Lease, Liability, Payments, Due after Year Five 165
Lessee, Operating Lease, Liability, Payments, Due 302
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 79
Operating Lease, Liability $ 223
Minimum [Member]  
Lessee, Lease, Description [Line Items]  
Lessee, Operating Lease, Term of Contract 1 year
Maximum [Member]  
Lessee, Lease, Description [Line Items]  
Lessee, Operating Lease, Term of Contract 15 years