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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Comprehensive Income [Abstract]        
NET INCOME $ 454 $ 391 $ 837 $ 1,023
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (7) (30) (21)
Amortized losses on derivative hedges 0 0 1 1
Other comprehensive loss (3) (7) (29) (20)
Income tax benefits on other comprehensive loss (1) (3) (7) (6)
Other comprehensive loss, net of tax (2) (4) (22) (14)
COMPREHENSIVE INCOME $ 452 $ 387 $ 815 $ 1,009