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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Comprehensive income:        
Net income $ 649 $ 609 $ 1,357 $ 1,282
Pension and retiree medical benefits:        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 10 0 11 0
Reclassifications of loss to net income, net of tax of $—, $1, $1 and $2, respectively 1 4 2 5
Derivative instruments:        
Net fair value increase, net of tax of $—, $1, $6 and $1, respectively 0 3 15 4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (1) (2) (4) (6)
Total other comprehensive income 12 9 32 15
Total comprehensive income $ 661 $ 618 $ 1,389 $ 1,297