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Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 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, 2015
 
$
(2,438
)
 
$
(5,135
)
 
$
293

 
$
(339
)
 
$
(7,619
)
Other comprehensive (loss) income before reclassifications, net
 
(1,042
)
 
(247
)
 
119

 
54

 
(1,116
)
Amounts reclassified, pre-tax
 
—

 
535

 
(94
)
 
171

 
612

Tax (benefit) expense reclassified
 
—

 
(198
)
 
35

 
(48
)
 
(211
)
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 (benefit) expense reclassified
 
—

 
(214
)
 
215

 
9

 
10

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

 
$
72

 
$
(7,525
)