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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, 2023     $ 1,074 $ 59
Capital contributions from parent   $ 0 0  
Net income $ 1,739 134   134
Cash distributions to parent   113   (113)
Balance at end of period at Sep. 30, 2024   1,154 1,074 80
Balance at beginning of period at Jun. 30, 2024     1,074 79
Capital contributions from parent     0  
Net income 706 38   38
Cash distributions to parent       (37)
Balance at end of period at Sep. 30, 2024   1,154 1,074 80
Balance at beginning of period at Dec. 31, 2024   1,163 1,074 89
Capital contributions from parent   (181) 181  
Net income 1,884 135   135
Cash distributions to parent   106   (106)
Balance at end of period at Sep. 30, 2025   1,373 1,255 118
Balance at beginning of period at Jun. 30, 2025     1,205 116
Capital contributions from parent     50  
Net income $ 647 44   44
Cash distributions to parent       (42)
Balance at end of period at Sep. 30, 2025   $ 1,373 $ 1,255 $ 118