Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of the entity's accumulated other comprehensive income (loss) by component

The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheet by component for the year ended December 31, 2020:

	Pension Plans		Post-Retirement Benefit Plans	Foreign Currency Translation Adjustment and Other	Interest Rate Swap	Total
	(Dollars in millions)
Balance at December 31, 2019	$	(2,229)	(184)	(228)	(39)	(2,680)
Other comprehensive loss before reclassifications	(115)		(103)	(37)	(86)	(341)
Amounts reclassified from accumulated other comprehensive loss	147		15	—	46	208
Net current-period other comprehensive income (loss)	32		(88)	(37)	(40)	(133)
Balance at December 31, 2020	$	(2,197)	(272)	(265)	(79)	(2,813)

The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheet by component for the year ended December 31, 2019:

	Pension Plans		Post-Retirement Benefit Plans	Foreign Currency Translation Adjustment and Other	Interest Rate Swap	Total
	(Dollars in millions)
Balance at December 31, 2018	$	(2,173)	(58)	(230)	—	(2,461)
Other comprehensive (loss) income before reclassifications	(219)		(138)	2	(41)	(396)
Amounts reclassified from accumulated other comprehensive loss	163		12	—	2	177
Net current-period other comprehensive (loss) income	(56)		(126)	2	(39)	(219)
Balance at December 31, 2019	$	(2,229)	(184)	(228)	(39)	(2,680)

Schedule of reclassifications out of accumulated other comprehensive income (loss) by component

The amount of realized losses reclassified in AOCI to the statement of operations consists of the following (in millions):

Derivatives designated as hedging instruments	2020		2019
Cash flow hedging contracts
Years Ended December 31,	$	62	2

The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component for the year ended December 31, 2020:

Year Ended December 31, 2020	(Decrease) Increase in Net Loss		Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Interest rate swaps	$	62	Interest expense
Income tax expense	(16)		Income tax expense
Net of tax	$	46
Amortization of pension & post-retirement plans (1)
Net actuarial loss	$	203	Other (expense) income, net
Prior service cost	7		Other (expense) income, net
Curtailment loss	4		Other (expense) income, net
Total before tax	214
Income tax benefit	(52)		Income tax expense
Net of tax	$	162

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(1)See Note 10—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.

The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component for the year ended December 31, 2019:

Year Ended December 31, 2019	(Decrease) Increase in Net Loss		Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Amortization of pension & post-retirement plans(1)
Interest rate swap	$	2	Interest expense
Net actuarial loss	224		Other (expense) income, net
Prior service cost	8		Other (expense) income, net
Total before tax	234
Income tax benefit	(57)		Income tax expense
Net of tax	$	177

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(1)See Note 10—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.