Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019 and 2018 is provided below:

	Quarter Ended March 31, 2019
(dollars in millions)	Foreign Currency Translation			Defined Benefit Pension and Post- retirement Plans			Unrealized Gains (Losses) on Available-for-Sale Securities		Unrealized Hedging (Losses) Gains			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(3,442	)	$	(5,718	)	$	—	$	(173	)	$	(9,333	)
Other comprehensive income (loss) before reclassifications, net	530			(1		)	—		7			536
Amounts reclassified, pre-tax	1			44			—		4			49
Tax benefit reclassified	(13		)	(10		)	—		(3		)	(26		)
ASU 2018-02 adoption impact	(8		)	(737		)	—		—			(745		)
Balance at March 31, 2019	$	(2,932	)	$	(6,422	)	$	—	$	(165	)	$	(9,519	)

	Quarter Ended March 31, 2018
(dollars in millions)	Foreign Currency Translation			Defined Benefit Pension and Post- retirement Plans			Unrealized Gains (Losses) on Available-for-Sale Securities			Unrealized Hedging (Losses) Gains			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017	$	(2,950	)	$	(4,652	)	$	5		$	72		$	(7,525	)
Other comprehensive income (loss) before reclassifications, net	376			8			—			45			429
Amounts reclassified, pre-tax	—			88			—			(27		)	61
Tax expense (benefit) reclassified	130			(23		)	—			(4		)	103
ASU 2016-01 adoption impact	—			—			(5		)	—			(5		)
Balance at March 31, 2018	$	(2,444	)	$	(4,579	)	$	—		$	86		$	(6,937	)