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Commitments And Contingencies (Lessee Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	40 years		40 years
Lease, Cost [Abstract]
Operating Lease, Cost	$ 15	$ 13	$ 41	$ 39
Finance Lease, Right-of-Use Asset, Amortization	0	2	3	2
Interest Expense	0	1	0	1
Short-term Lease, Cost	0	1	2	3
Operating Lease, Expense	1	1	3	3
Sublease Income	(10)	(12)	(30)	(33)
Lease, Cost	$ 6	$ 6	$ 19	15
Lease Term and Discount Rate [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	24 years		24 years			24 years
Finance Lease, Weighted Average Remaining Lease Term	9 years		9 years			6 years
Operating Lease, Weighted Average Discount Rate, Percent	6.00%		6.00%			6.00%
Finance Lease, Weighted Average Discount Rate, Percent	8.00%		8.00%			5.00%
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases			$ (39)	(39)
Operating cash flows from finance leases			0	(1)
Financing cash flows from finance leases			(3)	(2)
Leased assets obtained in exchange for new finance lease liabilities			0	37
Leased assets obtained in exchange for new operating lease liabilities			11	$ 22
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Operating lease - 2020 (remainder)	$ 12		12
Operating lease - 2021	50		50
Operating lease - 2022	48		48
Operating lease - 2023	46		46
Operating lease - 2024	45		45
Operating lease - Thereafter	847		847
Total lease payment	1,048		1,048
Less: interest	(501)		(501)
Present value of lease liabilities - operating leases	547		547
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Finance lease - 2020 (remainder)	0		0
Finance lease - 2021	1		1
Finance lease - 2022	1		1
Finance lease - 2023	1		1
Finance lease - 2024	1		1
Finance lease - Thereafter	5		5
Total lease payment	9		9
Less: interest	(3)		(3)
Present value of lease liabilities - finance leases	6		6		$ 32
Maturity of lease liabilities [Abstract]
2020 (remainder)	12		12
2021	51		51
2022	49		49
2023	47		47
2024	46		46
Thereafter	852		852
Total lease payment	1,057		1,057
Less: interest	(504)		(504)
Present value of lease liabilities	$ 553		$ 553
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	1 year		1 year
Lessee, Operating Lease, Term of Contract	5 years		5 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	20 years		20 years
Lessee, Operating Lease, Term of Contract	15 years		15 years