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Statement of Changes in Member's Equity (Unaudited) - NWP - USD ($)
$ in Millions
Total
Northwest Pipeline LLC [Member]
Member's Capital
Northwest Pipeline LLC [Member]
Retained Earnings
Northwest Pipeline LLC [Member]
Balance at beginning of period at Dec. 31, 2024     $ 1,074 $ 89
Cash contributions from parent   $ (131) 131  
Partners' Capital Account, Return of Capital     0  
Net income $ 1,237     91
Cash distributions to parent   64   (64)
Balance at end of period at Jun. 30, 2025   1,321 1,205 116
Balance at beginning of period at Mar. 31, 2025     1,159 111
Cash contributions from parent     46  
Partners' Capital Account, Return of Capital     0  
Net income 546     45
Cash distributions to parent       (40)
Balance at end of period at Jun. 30, 2025   1,321 1,205 116
Balance at beginning of period at Dec. 31, 2025   1,427 1,305 122
Cash contributions from parent   (25) 25  
Partners' Capital Account, Return of Capital     (2)  
Net income 1,692     99
Cash distributions to parent   79   (79)
Balance at end of period at Jun. 30, 2026   1,470 1,328 142
Balance at beginning of period at Mar. 31, 2026     1,328 145
Cash contributions from parent     0  
Partners' Capital Account, Return of Capital     0  
Net income $ 827     47
Cash distributions to parent       (50)
Balance at end of period at Jun. 30, 2026   $ 1,470 $ 1,328 $ 142