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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jul. 17, 2019	Nov. 30, 2017	Aug. 10, 2016	Jul. 31, 2012	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt, Gross Excluding Current Maturities	$ 3,620	$ 3,500
Debt Instrument, Unamortized Premium (Discount) and Debt Issuance Cost, Net, Excluding Current Maturities	(54)	(55)
Long-term Debt, Excluding Current Maturities	$ 3,566	3,445
Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	3.60%
Principal amount	$ 250	250				$ 250
Unamortized Premium (Discount) and Debt Issuance Costs	(1)	(1)
Long-term debt, net	$ 249	249
Senior Notes [Member] | 3.60% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	3.60%
Principal amount	$ 750	750			$ 750
Unamortized Premium (Discount) and Debt Issuance Costs	(6)	(8)
Long-term debt, net	744	742
Senior Notes [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member]
Debt Instrument [Line Items]
Principal amount	11	11
Unamortized Premium (Discount) and Debt Issuance Costs	0	0
Long-term debt, net	$ 11	11
Senior Notes [Member] | 6 1/2% GO Zone Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	6.50%
Principal amount	$ 0	100
Unamortized Premium (Discount) and Debt Issuance Costs	0	(1)
Long-term debt, net	$ 0	99
Senior Notes [Member] | 6 1/2% GO Zone Senior Notes Due 2035 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	6.50%
Principal amount	$ 0	89					$ 89
Unamortized Premium (Discount) and Debt Issuance Costs	0	(1)
Long-term debt, net	$ 0	88
Senior Notes [Member] | 6.5% 2035 IKE Zone Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	6.50%
Principal amount	$ 0	65					$ 65
Unamortized Premium (Discount) and Debt Issuance Costs	0	0
Long-term debt, net	$ 0	65
Senior Notes [Member] | 5.0% 2046 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
Principal amount	$ 700	700			$ 700
Unamortized Premium (Discount) and Debt Issuance Costs	(23)	(23)
Long-term debt, net	$ 677	677
Senior Notes [Member] | 4.375% Senior Notes Due 2047 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	4.375%
Principal amount	$ 500	500		$ 500
Unamortized Premium (Discount) and Debt Issuance Costs	(9)	(9)
Long-term debt, net	$ 491	491
Senior Notes [Member] | 3.50% Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	3.50%
Principal amount	$ 250	250
Unamortized Premium (Discount) and Debt Issuance Costs	(1)	(1)
Long-term debt, net	$ 249	249
Senior Notes [Member] | 1.625% Senior Notes Due 2029
Debt Instrument [Line Items]
Stated interest rate (percent)	1.625%
Principal amount	$ 859	785
Unamortized Premium (Discount) and Debt Issuance Costs	(10)	(11)
Long-term debt, net	$ 849	774	$ 779
Senior Notes [Member] | 3.375 Senior Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate (percent)	3.375%
Principal amount	$ 300	0
Unamortized Premium (Discount) and Debt Issuance Costs	(4)	0
Long-term debt, net	$ 296	$ 0

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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