Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

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

A summary of the changes in each component of Accumulated other comprehensive (loss) income, net of tax for the years ended December 31, 2019 and 2018 is provided below:

(dollars in millions)	Foreign Currency Translation		Defined Benefit Pension and Postretirement 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 before reclassifications, net	(486)		(1,736)		—		(307)		(2,529)
Amounts reclassified, pre-tax	(2)		344		—		(16)		326
Tax (expense) benefit	(4)		326		—		78		400
ASU 2016-01 adoption impact	$	—	$	—	$	(5)	$	—	$	(5)
Balance at December 31, 2018	$	(3,442)	$	(5,718)	$	—	$	(173)	$	(9,333)
Other comprehensive loss before reclassifications, net	280		(584)		—		(33)		(337)
Amounts reclassified, pre-tax	2		170		—		51		223
Tax (expense) benefit	(43)		97		—		(11)		43
ASU 2018-02 adoption impact	(8)		(737)		—		—		(745)
Balance at December 31, 2019	$	(3,211)	$	(6,772)	$	—	$	(166)	$	(10,149)