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Equity (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 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, 2014
 
$
(1,051
)
 
$
(5,709
)
 
$
308

 
$
(209
)
 
$
(6,661
)
Other comprehensive (loss) income before reclassifications, net
 
(1,429
)
 
32

 
16

 
(298
)
 
(1,679
)
Amounts reclassified, pre-tax
 
42

 
867

 
(54
)
 
234

 
1,089

Tax (benefit) expense reclassified
 
—

 
(325
)
 
23

 
(66
)
 
(368
)
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
)