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RECLASSIFICATIONS FROM OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
12 Months Ended
Dec. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of reclassifications from accumulated other comprehensive income (loss) to the condensed consolidated statements of operations
The reclassifications from accumulated other comprehensive loss to the consolidated statements of operations were as follows, in millions:
Accumulated Other
Comprehensive Loss
202020192018Statement of Operations Line Item
Amortization of defined-benefit pension and other post-retirement benefits:
Actuarial losses, net and prior service cost$26 $20 $20 Other income (expense), net
Tax (benefit)(7)(5)(5) 
Net of tax$19 $15 $15  
Interest rate swaps$$$Interest expense
Tax (benefit)(1)— —  
Net of tax$$$