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Debt - Debt With Interest Rates And Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance leases | $ 25 | $ 8
Discounts, premiums, and debt issuance costs | (1,012) | (809)
Total debt | 12,681 | 12,196
Less current maturities | (579) | (316)
Long-term debt | 12,102 | 11,880
3.65% maturing to 2025 |  |
Debt Instrument [Line Items] |  |
Notes and debentures | $ 2,673 | 3,048
Long-term debt, weighted average interest rate | 3.65% |
4.32% maturing 2026 to 2031 |  |
Debt Instrument [Line Items] |  |
Notes and debentures | $ 2,714 | 2,714
Long-term debt, weighted average interest rate | 4.32% |
4.11% maturing 2037 to 2055 |  |
Debt Instrument [Line Items] |  |
Notes and debentures | $ 7,497 | 5,904
Long-term debt, weighted average interest rate | 4.11% |
4.11% maturing 2037 to 2055 |  |
Debt Instrument [Line Items] |  |
Notes and debentures | $ 784 | $ 1,331
Long-term debt, weighted average interest rate | 6.07% |

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: 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=120520924&loc=SL6031897-161870 Reference 2: 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=119993939&loc=d3e28555-108399 + Details
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