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Summary of Non-cash Operating, Investing and Financing Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]  
Effects on net assets of non-cash operating, investing and financing activities
The effect on net assets of non-cash operating, investing and financing activities was as follows:
(dollars in millions)
2015
 
2014
 
2013
 
 
 
 
 
 
Tax benefit of stock compensation plan transactions
$
2

 
$
6

 
$
10

Change in fair value of derivatives accounted for as cash flow hedges, net of tax
$
(65
)
 
$
(76
)
 
$
14

Actuarial gain (loss), net, related to defined benefit pension and postretirement benefit plans
$
8

 
$
(35
)
 
$
13