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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

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