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Revenues from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | $ 8,663 | $ 8,943 | $ 10,661
Sales of Purchased Product [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,487 | 1,585 | 2,849
Sales of Purchased Product [Member] | Market Optimization Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,487 | 1,585 | 2,849
Operating Segments [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 5,884 | 7,061 | 8,176
Operating Segments [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 2,779 | 1,882 | 2,485
Operating Segments [Member] | Sales of Purchased Product [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,311 | 1,449 | 2,590
Operating Segments [Member] | Sales of Purchased Product [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 176 | 136 | 259
Corporate & Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Corporate & Other [Member] | Sales of Purchased Product [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Corporate & Other [Member] | Sales of Purchased Product [Member] | Market Optimization Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Oil [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 3,423 | 4,559 | 4,447
Oil [Member] | Operating Segments [Member] | Product Revenue [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 3,413 | 4,549 | 4,444
Oil [Member] | Operating Segments [Member] | Product Revenue [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 10 | 10 | 3
Oil [Member] | Corporate & Other [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Natural Gas Liquids [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 2,115 | 1,732 | 1,708
Natural Gas Liquids [Member] | Operating Segments [Member] | Product Revenue [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 693 | 740 | 679
Natural Gas Liquids [Member] | Operating Segments [Member] | Product Revenue [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,422 | 992 | 1,029
Natural Gas Liquids [Member] | Corporate & Other [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Natural Gas [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,606 | 1,059 | 1,650
Natural Gas [Member] | Operating Segments [Member] | Product Revenue [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 447 | 318 | 458
Natural Gas [Member] | Operating Segments [Member] | Product Revenue [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 1,159 | 741 | 1,192
Natural Gas [Member] | Corporate & Other [Member] | Product Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 0 | 0 | 0
Natural Gas Gathering and Processing, and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 32 | 8 | 7
Natural Gas Gathering and Processing, and Other [Member] | Operating Segments [Member] | USA Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 20 | 5 | 5
Natural Gas Gathering and Processing, and Other [Member] | Operating Segments [Member] | Canadian Operations Excluding Intercompany Segment Transactions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | 12 | 3 | 2
Natural Gas Gathering and Processing, and Other [Member] | Corporate & Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Product and service revenues | $ 0 | $ 0 | $ 0

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