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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
NET INCOME $ 335 $ 74
OTHER COMPREHENSIVE LOSS:    
Pension and OPEB prior service costs (3) (23)
Other comprehensive loss (3) (23)
Income tax benefits on other comprehensive loss (1) (5)
Other comprehensive loss, net of tax (2) (18)
COMPREHENSIVE INCOME $ 333 $ 56