Leases (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	108 years	108 years
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 8	$ 8
Operating Lease, Cost	10	31
Short-term Lease, Cost	0	0
Variable Lease, Cost	7	21
Sublease Income	0	(1)
Lease, Cost	17	51
Operating Lease, Payments	10	30
Operating Lease, Right-of-Use Asset	213	213
Operating Lease, Liability, Current	23	23
Operating Lease, Liability, Noncurrent	$ 190	$ 190
Operating Lease, Weighted Average Remaining Lease Term	13 years	13 years
Operating Lease, Weighted Average Discount Rate, Percent	4.60%	4.60%
Lessee, Operating Lease, Liability, Payments, Due Year Two	$ 32	$ 32
Lessee, Operating Lease, Liability, Payments, Due Year Three	33	33
Lessee, Operating Lease, Liability, Payments, Due Year Four	27	27
Lessee, Operating Lease, Liability, Payments, Due Year Five	21	21
Lessee, Operating Lease, Liability, Payments, Due after Year Five	171	171
Lessee, Operating Lease, Liability, Payments, Due	292	292
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	79	79
Operating Lease, Liability	$ 213	$ 213
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	15 years	15 years