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Statement of Cash Flows (Unaudited) - NWP - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
OPERATING ACTIVITIES:    
Net income (loss) $ 1,788 $ 1,312
Adjustments to reconcile to net cash provided (used) by operating activities:    
Depreciation, depletion, and amortization 1,176 1,190
Cash provided (used) by changes in current assets and liabilities:    
Increase (Decrease) in Inventories (32) (61)
Other current assets and deferred charges (23) (36)
Other current liabilities (58) 150
Other, including changes in noncurrent assets and liabilities (115) (77)
Net cash provided (used) by operating activities 2,979 2,883
FINANCING ACTIVITIES:    
Proceeds from other financing obligations 2,790 2,994
Payments on other financing obligations (1,119) (975)
Net cash provided (used) by financing activities (49) 154
INVESTING ACTIVITIES:    
Capital expenditures (1) (3,193) (1,984)
Net cash provided (used) by investing activities (2,790) (2,194)
Increase (decrease) in cash and cash equivalents 140 843
Cash and cash equivalents at beginning of year 63 60
Cash and cash equivalents at end of period 203 903
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]    
(1) Increases to property, plant, and equipment, exclusive of equity AFUDC (3,347) (2,041)
Capital expenditures (3,193) (1,984)
Northwest Pipeline LLC [Member]    
OPERATING ACTIVITIES:    
Net income (loss) 99 91
Adjustments to reconcile to net cash provided (used) by operating activities:    
Depreciation, depletion, and amortization 61 59
Allowance for equity funds used during construction (equity AFUDC) (5) (3)
Cash provided (used) by changes in current assets and liabilities:    
Trade and other accounts receivable (5) 3
Other current assets and deferred charges 2 1
Trade accounts payable 1 (2)
Affiliate payables (1) (4)
Other current liabilities (2) (3)
Other, including changes in noncurrent assets and liabilities (21) (26)
Net cash provided (used) by operating activities 129 116
FINANCING ACTIVITIES:    
Cash distributions to parent (79) (64)
Cash contributions from parent 25 131
Advances from affiliate – net 0 (26)
Net cash provided (used) by financing activities (54) 41
INVESTING ACTIVITIES:    
Capital expenditures (1) (79) (92)
Contributions and advances for construction costs 4 5
Dispositions – net (6) (6)
Advances to affiliate – net 6 (64)
Net cash provided (used) by investing activities (75) (157)
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of year 0 0
Cash and cash equivalents at end of period 0 0
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]    
(1) Increases to property, plant, and equipment, exclusive of equity AFUDC (93) (89)
Changes in related accounts payable and accrued liabilities 14 (3)
Capital expenditures $ (79) $ (92)