Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2018

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

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

The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the nine months ended September 30, 2018:



	Pension Plans			Post-Retirement Benefit Plans		Foreign Currency Translation Adjustment and Other		Total
	(Dollars in millions)
Balance at December 31, 2017	$	(1,731	)	(235	)	(29	)	(1,995	)
Other comprehensive income before reclassifications	—			—		(161	)	(161	)
Amounts reclassified from accumulated other comprehensive income	97			12		—		109
Net current-period other comprehensive income	97			12		(161	)	(52	)
Cumulative effect of adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	(375		)	(32	)	—		(407	)
Balance at September 30, 2018	$	(2,009	)	(255	)	(190	)	(2,454	)

The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the nine months ended September 30, 2017:



	Pension Plans			Post-Retirement Benefit Plans		Foreign Currency Translation Adjustment and Other		Total
	(Dollars in millions)
Balance at December 31, 2016	$	(1,895	)	(162	)	(60	)	(2,117	)
Other comprehensive income before reclassifications	—			—		20		20
Amounts reclassified from accumulated other comprehensive income	93			10		—		103
Net current-period other comprehensive income	93			10		20		123
Balance at September 30, 2017	$	(1,802	)	(152	)	(40	)	(1,994	)

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

The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended September 30, 2018:



Three Months Ended September 30, 2018	Decrease (Increase) in Net Income			Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Amortization of pension & post-retirement plans⁽¹⁾
Net actuarial loss	$	45		Other income (expense), net
Prior service cost	3			Other income (expense), net
Total before tax	48
Income tax benefit	(11		)	Income tax expense
Net of tax	$	37



Nine Months Ended September 30, 2018	Decrease (Increase) in Net Income			Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Amortization of pension & post-retirement plans⁽¹⁾
Net actuarial loss	$	135		Other income (expense), net
Prior service cost	9			Other income (expense), net
Total before tax	144
Income tax benefit	(35		)	Income tax expense
Net of tax	$	109

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(1)	See Note 8—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.

The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended September 30, 2017:



Three Months Ended September 30, 2017	Decrease (Increase) in Net Income			Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Amortization of pension & post-retirement plans⁽¹⁾
Net actuarial loss	$	51		Other income (expense), net
Prior service cost	3			Other income (expense), net
Total before tax	54
Income tax benefit	(16		)	Income tax expense
Net of tax	$	38

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(1)	See Note 8—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.



Nine Months Ended September 30, 2017	Decrease (Increase) in Net Income			Affected Line Item in Consolidated Statement of Operations
	(Dollars in millions)
Amortization of pension & post-retirement plans⁽¹⁾
Net actuarial loss	$	154		Other income (expense), net
Prior service cost	9			Other income (expense), net
Total before tax	163
Income tax benefit	(60		)	Income tax expense
Net of tax	$	103

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(1)	See Note 8—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.