Leases - Schedule of Supplemental Balance Sheet (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Operating leases | ||||
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets (Note 9) | Other assets (Note 9) | Other assets (Note 9) | |
| Other assets | $ 860 | $ 860 | $ 796 | |
| Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other accrued liabilities (Notes 9 and 12) | Other accrued liabilities (Notes 9 and 12) | Other accrued liabilities (Notes 9 and 12) | |
| Other accrued liabilities | $ 97 | $ 97 | $ 95 | |
| Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other liabilities (Notes 9 and 12) | Other liabilities (Notes 9 and 12) | Other liabilities (Notes 9 and 12) | |
| Other liabilities | $ 846 | $ 846 | $ 785 | |
| Total operating lease liabilities | 943 | 943 | 880 | |
| Finance leases | ||||
| Property, plant and equipment | 1,279 | 1,279 | 265 | |
| Accumulated depreciation | $ (147) | $ (147) | $ (118) | |
| Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, plant and equipment, net of accumulated depreciation - $15,229 and $14,492 (Note 6) | Property, plant and equipment, net of accumulated depreciation - $15,229 and $14,492 (Note 6) | Property, plant and equipment, net of accumulated depreciation - $15,229 and $14,492 (Note 6) | |
| Property, plant and equipment, net | $ 1,132 | $ 1,132 | $ 147 | |
| Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Current portion of long-term debt and short-term borrowings (Note 10) | Current portion of long-term debt and short-term borrowings (Note 10) | Current portion of long-term debt and short-term borrowings (Note 10) | |
| Current portion of long-term debt and short-term borrowings | $ 84 | $ 84 | $ 30 | |
| Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt | Long-term debt | |
| Long-term debt | $ 1,148 | $ 1,148 | $ 144 | |
| Total finance lease liabilities | 1,232 | 1,232 | 174 | |
| Finance leases | 1,389 | 21 | $ 30 | |
| Financing cash outflows from finance leases | 346 | $ 30 | $ 36 | |
| Government Incentives, 48D Credits | ||||
| Finance leases | ||||
| Right-of-use asset, tax incentive | 318 | 318 | ||
| Facility Lease | ||||
| Finance leases | ||||
| Property, plant and equipment, net | 797 | 797 | ||
| Long-term debt | 797 | 797 | ||
| Financing cash outflows from finance leases | 315 | 315 | ||
| Facility Lease | Government Incentives, 48D Credits | ||||
| Finance leases | ||||
| Right-of-use asset, tax incentive | $ 189 | $ 189 | ||