Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 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 six months ended June 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	—			—		(160	)	(160	)
Amounts reclassified from accumulated other comprehensive income	65			7		—		72
Net current-period other comprehensive income	65			7		(160	)	(88	)
Cumulative effect of adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	(375		)	(32	)	—		(407	)
Balance at June 30, 2018	$	(2,041	)	(260	)	(189	)	(2,490	)

The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the six months ended June 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	—			—		2		2
Amounts reclassified from accumulated other comprehensive income	59			6		—		65
Net current-period other comprehensive income	59			6		2		67
Balance at June 30, 2017	$	(1,836	)	(156	)	(58	)	(2,050	)

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 six months ended June 30, 2018:



Three Months Ended June 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	$	46		Other income (expense), net
Prior service cost	3			Other income (expense), net
Total before tax	49
Income tax benefit	(12		)	Income tax expense
Net of tax	$	37



Six Months Ended June 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	$	90		Other income (expense), net
Prior service cost	6			Other income (expense), net
Total before tax	96
Income tax benefit	(24		)	Income tax expense
Net of tax	$	72

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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 six months ended June 30, 2017:



Three Months Ended June 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	$	52		Other income (expense), net
Prior service cost	3			Other income (expense), net
Total before tax	55
Income tax benefit	(23		)	Income tax expense
Net of tax	$	32

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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.



Six Months Ended June 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	$	103		Other income (expense), net
Prior service cost	6			Other income (expense), net
Total before tax	109
Income tax benefit	(44		)	Income tax expense
Net of tax	$	65

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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.