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Commitments And Contingencies (Lessee Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	40 years		40 years
Lease, Cost [Abstract]
Operating Lease, Cost	$ 14	$ 14	$ 26	$ 26
Finance Lease, Right-of-Use Asset, Amortization	2	0	3	0
Interest Expense	0	0	1	0
Short-term Lease, Cost	1	1	2	2
Operating Lease, Expense	1	1	2	2
Sublease Income	(10)	(11)	(20)	(21)
Lease, Cost	$ 8	$ 5	$ 14	9
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	5 years		5 years			10 years
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases			$ (26)	(28)
Operating cash flows from finance leases			0	0
Financing cash flows from finance leases			(3)	0
Leased assets obtained in exchange for new finance lease liabilities			0	0
Leased assets obtained in exchange for new operating lease liabilities			9	$ 14
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Operating lease - 2020 (remainder)	$ 25		25
Operating lease - 2022	48		48
Operating lease - 2023	46		46
Operating lease - Thereafter	840		840
Total lease payment	1,048		1,048
Less: interest	(505)		(505)
Present value of lease liabilities - operating leases	543		543
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Finance lease - 2020 (remainder)	4		4
Finance lease - 2022	7		7
Finance lease - 2023	7		7
Finance lease - 2024	7		7
Finance lease - Thereafter	5		5
Total lease payment	34		34
Less: interest	(5)		(5)
Present value of lease liabilities - finance leases	29		29		$ 32
Maturity of lease liabilities [Abstract]
2020 (remainder)	29		29
2021	55		55
2022	53		53
2023	52		52
2024	48		48
Thereafter	845		845
Total lease payment	1,082		1,082
Less: interest	(510)		(510)
Present value of lease liabilities	572		572
Lessee, Operating Lease, Liability, to be Paid, Year Five	44		44
Finance Lease, Liability, to be Paid, Year Five	$ 4		$ 4
Operating Lease, Weighted Average Discount Rate, Percent	6.00%		6.00%			6.00%
Finance Lease, Weighted Average Discount Rate, Percent	5.00%		5.00%			8.00%
Lessee, Operating Lease, Liability, to be Paid, Year Five	$ 45		$ 45
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years		5 years
Lessee, Operating Lease, Renewal Term	1 year		1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	15 years		15 years
Lessee, Operating Lease, Renewal Term	20 years		20 years