Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2021

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

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

A summary of the changes in each component of Accumulated other comprehensive loss, net of tax for the quarters ended March 31, 2021 and 2020 is provided below:

(dollars in millions)	Foreign Currency Translation		Defined Benefit Pension and Post-retirement Plans		Unrealized Hedging (Losses) Gains		Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2020	$	710	$	(4,483)	$	39	$	(3,734)
Other comprehensive income (loss) before reclassifications, net	(176)		(10)		(46)		(232)
Amounts reclassified, pre-tax	—		64		(14)		50
Tax benefit (expense)	(5)		(12)		12		(5)
Balance at March 31, 2021	$	529	$	(4,441)	$	(9)	$	(3,921)

(dollars in millions)	Foreign Currency Translation		Defined Benefit Pension and Post-retirement Plans		Unrealized Hedging (Losses) Gains		Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2019	$	(3,211)	$	(6,772)	$	(166)	$	(10,149)
Other comprehensive income (loss) before reclassifications, net	(1,445)		8		(403)		(1,840)
Amounts reclassified, pre-tax	—		102		29		131
Tax expense (benefit)	9		(31)		92		70
Balance at March 31, 2020	$	(4,647)	$	(6,693)	$	(448)	$	(11,788)