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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parentheticals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Postretirement benefit plan remeasurement, net of tax expense     $ 29
Postretirement benefit plan reclassification, net of tax benefit $ 2 $ 3 $ 1