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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Comprehensive income:        
Net income $ 609 $ 603 $ 1,282 $ 1,185
Pension and retiree medical benefits:        
Reclassifications of loss to net income, net of tax of $1, $—, $2 and $1, respectively 4 1 5 4
Derivative instruments:        
Net fair value increase (decrease), net of tax of $1, $—, $1 and $(3), respectively 3 0 4 (10)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (2) (1) (6) (4)
Total other comprehensive income (loss) 9 2 15 (2)
Total comprehensive income $ 618 $ 605 $ 1,297 $ 1,183