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Debt (Schedule Of Debt) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt	$ 28,267,000,000
Unamortized discount and deferred issuance costs	(1,538,000,000)	$ (1,194,000,000)
Total debt	26,729,000,000	25,200,000,000
Less: current portion	(1,069,000,000)	(1,257,000,000)
Total long-term debt	25,660,000,000	23,943,000,000
Bank Note [Member]
Debt Instrument [Line Items]
Debt	$ 26,608,000,000	24,008,000,000
Debt due through	Feb. 05, 2070
Bank Note [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.20%
Bank Note [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	7.10%
Pass-Through Trust Certificate [Member]
Debt Instrument [Line Items]
Debt	$ 885,000,000	923,000,000
Debt due through	Jan. 02, 2031
Pass-Through Trust Certificate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.60%
Pass-Through Trust Certificate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	6.20%
Finance leases [Member]
Debt Instrument [Line Items]
Debt	$ 449,000,000	605,000,000
Debt due through	Dec. 10, 2028
Finance leases [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.10%
Finance leases [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	8.00%
Receivables Securitization (Note 11) [Member]
Debt Instrument [Line Items]
Debt	$ 0	400,000,000
Term loans - floating rate [Member]
Debt Instrument [Line Items]
Debt	$ 250,000,000	250,000,000
Debt due through	Oct. 28, 2021
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt	$ 75,000,000	200,000,000
Debt due through	Jan. 21, 2021
Commercial Paper [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	0.20%
Commercial Paper [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	0.30%
Medium-term notes [Member]
Debt Instrument [Line Items]
Debt		$ 8,000,000

X

- Definition

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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Contractual interest rate for funds borrowed, under the debt agreement.

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