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Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Changes in accumulated other comprehensive loss by component, net of income taxes Changes in accumulated other comprehensive loss by component, net of income taxes, consisted of the following:
Year Ended December 31, 2020
(In millions)Cash Flow
Hedges
Foreign
Currency
Translation
Pension PlansTotal
Balance at December 31, 2019$(141)$(33)$(6)$(180)
Other comprehensive (loss) income before reclassifications(221)(6)(222)
Amounts reclassified from accumulated other comprehensive loss15 — — 15 
Net current-period other comprehensive (loss) income 20 (221)(6)(207)
Balance at December 31, 2020$(121)$(254)$(12)$(387)
Year Ended December 31, 2019
(In millions)Cash Flow
Hedges
Foreign
Currency
Translation
Pension PlansTotal
Balance at December 31, 2018$(16)$(49)$(2)$(67)
Other comprehensive (loss) income before reclassifications(134)16 (4)(122)
Amounts reclassified from accumulated other comprehensive loss— — 
Net current-period other comprehensive (loss) income(125)16 (4)(113)
Balance at December 31, 2019$(141)$(33)$(6)$(180)