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Debt and Derivatives - Classification and Credit Facilities (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2024 | Dec. 31, 2024 | Oct. 31, 2024 | Aug. 28, 2024 | Dec. 31, 2023
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 4,000 |  |  |
Current portion of long-term debt |  | 1,359 |  |  | $ 334
Tax Exempt Bonds [Member] |  |  |  |  |
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | 298 |  |  |
Debt with interest rate periods that expire in the next 12 months |  | 1,400 |  |  |
Debt classified as long-term due to intent and ability to refinance on long-term basis |  | $ 2,600 |  |  |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  | 0.70% |  |  |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  | 4.80% |  |  |
Commercial Paper Program [Member] |  |  |  |  |
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 1,200 |  |  |
Debt term |  | 397 days |  |  |
Commercial paper borrowings |  | $ 1,200 |  |  |
3.125% senior notes due March 2025 [Member] |  |  |  |  |
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 422 |  |  |
Interest rate (as a percent) |  | 3.125% |  |  |
0.750% senior notes due 2025 [Member] |  |  |  |  |
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 500 |  |  |
Interest rate (as a percent) |  | 0.75% |  |  |
Financing leases and other [Member] |  |  |  |  |
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 438 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity |  | 3,500 |  |  |
Accordion option capacity | $ 1,000 |  |  |  |
Outstanding borrowings under credit facility |  | 0 |  |  |
Letters of credit outstanding |  | 224 |  |  |
Unused and available credit capacity |  | 2,100 |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Debt |  |  |  |  |
Spread rate (as a percent) | 0.585% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Debt |  |  |  |  |
Spread rate (as a percent) | 1.025% |  |  |  |
Credit Facility Revolving Canadian [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity | $ 375 |  |  |  |
Term Credit Agreement [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity |  |  |  | $ 7,200 |
Debt instrument face amount |  |  | $ 5,200 |  |
Other Letter Of Credit Lines [Member] |  |  |  |  |
Debt |  |  |  |  |
Letters of credit outstanding |  | $ 862 |  |  |

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