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Debt - Components (Detail) $ in Millions, $ in Millions | Jun. 30, 2024 USD ($) | Jun. 30, 2024 CAD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | ---
Debt |  |  |
Debt | $ 16,743 |  | $ 16,229
Debt issuance costs, discounts and other | (117) |  | (123)
Current portion of long-term debt | 242 |  | 334
Long-term debt, less current portion | 16,501 |  | 15,895
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Debt | $ 1,565 |  | $ 860
Weighted average interest rate | 5.50% | 5.50% | 5.60%
Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Debt | $ 11,220 |  | $ 11,376
Weighted average interest rate | 3.70% | 3.70% | 3.70%
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 0.75% | 0.75% | 0.75%
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 7.75% | 7.75% | 7.75%
Canadian Senior Notes [Member] |  |  |
Debt |  |  |
Debt | $ 366 | $ 500 | $ 378
Interest rate (as a percent) | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt | $ 2,853 |  | $ 2,883
Weighted average interest rate | 3.30% | 3.30% | 3.30%
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 0.55% | 0.55% | 0.55%
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 5.00% | 5.00% | 5.00%
Financing leases and other [Member] |  |  |
Debt |  |  |
Debt | $ 856 |  | $ 855
Weighted average interest rate | 5.00% | 5.00% | 5.00%

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