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Commitments and Contingencies - Schedule of Environmental Matters and Legal Proceedings (Details) - Eastern Ohio Incident - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Loss Contingency Accrual [Roll Forward] |  |  |  |
Loss contingency accrual, beginning balance | $ 663 | $ 688 | $ 1,037 | $ 464
Loss contingency receivable, beginning balance | (120) | (18) | (98) | 0
Loss contingency accrual net of recoveries, beginning balance | 543 | 670 | 939 | 464
Loss contingency recognized | 107 | 39 | 91 | 700
Loss contingency accrual payments | (49) | (64) | (151) | (127)
Loss contingency, receivable, additions | (154) | (224) | (156) | (108)
Loss contingency, receivable, proceeds | 225 | 122 | 135 | 10
Loss contingency accrual provision net of recoveries | (47) | (185) | (65) | 592
Loss contingency accrual payments net of recoveries | 176 | 58 | (16) | (117)
Loss contingency accrual, ending balance | 721 | 663 | 977 | 1,037
Loss contingency receivable, ending balance | (49) | (120) | (119) | (98)
Loss contingency accrual net of recoveries, ending balance | 672 | 543 | 858 | 939
Environmental |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Loss contingency accrual, beginning balance | 227 | 244 | 292 | 319
Loss contingency recognized | 0 | 0 | 53 | 60
Loss contingency accrual payments | (18) | (17) | (80) | (87)
Loss contingency accrual, ending balance | 209 | 227 | 265 | 292
Legal Contingencies And Other |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Loss contingency accrual, beginning balance | 436 | 444 | 745 | 145
Loss contingency recognized | 107 | 39 | 38 | 640
Loss contingency accrual payments | (31) | (47) | (71) | (40)
Loss contingency accrual, ending balance | $ 512 | $ 436 | $ 712 | $ 745

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