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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (PARENTHETICAL) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Postretirement benefit plan reclassification, net of tax benefit $ 1 $ 2 $ 3 $ 4