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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
NET INCOME $ 58 $ 309 $ 393 $ 383
OTHER COMPREHENSIVE LOSS:        
Pension and OPEB prior service costs (4) (4) (7) (27)
Amortized losses on derivative hedges 1 1 1 1
Other comprehensive loss (3) (3) (6) (26)
Income tax benefits on other comprehensive loss (1) (1) (2) (6)
Other comprehensive loss, net of tax (2) (2) (4) (20)
COMPREHENSIVE INCOME $ 56 $ 307 $ 389 $ 363