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Debt - Debt With Interest Rates And Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Finance leases | $ 22 | $ 25
Discounts, premiums, and debt issuance costs | (976) | (1,012)
Total debt | 13,840 | 12,681
Less current maturities | (553) | (579)
Long-term debt | $ 13,287 | 12,102
3.40% maturing to 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt, weighted average interest rate | 3.40% |
Notes and debentures | $ 2,699 | 3,273
4.26% maturing 2027 to 2031 |  |
Debt Instrument [Line Items] |  |
Long-term debt, weighted average interest rate | 4.26% |
Notes and debentures | $ 2,614 | 2,114
4.02% maturing 2037 to 2055 |  |
Debt Instrument [Line Items] |  |
Long-term debt, weighted average interest rate | 4.02% |
Notes and debentures | $ 8,097 | 7,497
5.22% maturing 2097 to 2121 |  |
Debt Instrument [Line Items] |  |
Long-term debt, weighted average interest rate | 5.22% |
Notes and debentures | $ 1,384 | $ 784

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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