v3.26.1
Fair Value Measurements - PAC (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Recurring    
Assets:    
Derivative asset, offset $ (4) $ (8)
Assets, fair value 6,042 3,566
Liabilities:    
Derivative liability, offset 77 84
Derivative liability (143) (157)
Cash collateral receivable 73 76
Recurring | Money market mutual funds    
Assets:    
Money market mutual funds 3,986 1,469
Recurring | Level 1    
Assets:    
Assets, fair value 5,103 2,648
Liabilities:    
Derivative liability (15) (13)
Recurring | Level 1 | Money market mutual funds    
Assets:    
Money market mutual funds 3,986 1,469
Recurring | Level 2    
Assets:    
Assets, fair value 931 916
Liabilities:    
Derivative liability (136) (172)
Recurring | Level 2 | Money market mutual funds    
Assets:    
Money market mutual funds 0 0
Recurring | Level 3    
Assets:    
Assets, fair value 12 10
Liabilities:    
Derivative liability (69) (56)
Recurring | Level 3 | Money market mutual funds    
Assets:    
Money market mutual funds 0 0
Commodity derivatives | Recurring    
Assets:    
Derivative asset, offset (4) (8)
Derivative asset 38 41
Liabilities:    
Derivative liability, offset 77 83
Derivative liability (141) (155)
Commodity derivatives | Recurring | Level 1    
Assets:    
Derivative asset, gross 1 0
Liabilities:    
Derivative liability, gross (15) (13)
Commodity derivatives | Recurring | Level 2    
Assets:    
Derivative asset, gross 41 47
Liabilities:    
Derivative liability, gross (136) (169)
Commodity derivatives | Recurring | Level 3    
Assets:    
Derivative asset, gross 0 2
Liabilities:    
Derivative liability, gross (67) (56)
PAC | Recurring    
Assets:    
Equity securities 22 28
Assets, fair value 2,192 117
PAC | Recurring | Money market mutual funds    
Assets:    
Money market mutual funds 2,167 84
PAC | Recurring | Level 1    
Assets:    
Equity securities 22 28
Assets, fair value 2,189 112
PAC | Recurring | Level 1 | Money market mutual funds    
Assets:    
Money market mutual funds 2,167 84
PAC | Recurring | Level 2    
Assets:    
Equity securities 0 0
Assets, fair value 6 10
PAC | Recurring | Level 2 | Money market mutual funds    
Assets:    
Money market mutual funds 0 0
PAC | Recurring | Level 3    
Assets:    
Equity securities 0 0
Assets, fair value 0 0
PAC | Recurring | Level 3 | Money market mutual funds    
Assets:    
Money market mutual funds 0 0
PAC | Commodity derivatives    
Liabilities:    
Cash collateral receivable 65 71
PAC | Commodity derivatives | Recurring    
Assets:    
Derivative asset, offset (3) (5)
Derivative asset 3 5
Liabilities:    
Derivative liability, offset 68 76
Derivative liability (49) (71)
Cash collateral receivable 65 71
PAC | Commodity derivatives | Recurring | Level 1    
Assets:    
Derivative asset, gross 0 0
Liabilities:    
Derivative liability, gross 0 0
PAC | Commodity derivatives | Recurring | Level 2    
Assets:    
Derivative asset, gross 6 10
Liabilities:    
Derivative liability, gross (117) (147)
PAC | Commodity derivatives | Recurring | Level 3    
Assets:    
Derivative asset, gross 0 0
Liabilities:    
Derivative liability, gross $ 0 $ 0