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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 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, 2016
 
$
(3,480
)
 
$
(5,045
)
 
$
353

 
$
(162
)
 
$
(8,334
)
Other comprehensive income before reclassifications, net
 
540

 
78

 
3

 
264

 
885

Amounts reclassified, pre-tax
 
(10
)
 
529

 
(566
)
 
(39
)
 
(86
)
Tax (expense) benefit reclassified
 
—

 
(214
)
 
215

 
9

 
10

Balance at December 31, 2017
 
$
(2,950
)
 
$
(4,652
)
 
$
5

 
$
72

 
$
(7,525
)
Other comprehensive loss before reclassifications, net
 
(486
)
 
(1,736
)
 
—

 
(307
)
 
(2,529
)
Amounts reclassified, pre-tax
 
(2
)
 
344

 
—

 
(16
)
 
326

Tax (expense) benefit reclassified
 
(4
)
 
326

 
—

 
78

 
400

ASU 2016-01 adoption impact
 
—

 
—

 
(5
)
 
—

 
(5
)
Balance at December 31, 2018
 
$
(3,442
)
 
$
(5,718
)
 
$
—

 
$
(173
)
 
$
(9,333
)