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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
(Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Long-term receivables
$
138

 
$
—

 
$
138

 
$
—

Customer financing notes receivable
250

 
—

 
250

 
—

Short-term borrowings
(2,314
)
 
—

 
(2,180
)
 
(134
)
Long-term debt (excluding capitalized leases)
(22,530
)
 
—

 
(22,138
)
 
(392
)
Long-term liabilities
(276
)
 
—

 
(276
)
 
—

 
March 31, 2015
 
December 31, 2014
(Dollars in millions)
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Long-term receivables
$
146

 
$
138

 
$
214

 
$
204

Customer financing notes receivable
252

 
250

 
262

 
260

Short-term borrowings
(2,314
)
 
(2,314
)
 
(126
)
 
(126
)
Long-term debt (excluding capitalized leases)
(19,650
)
 
(22,530
)
 
(19,634
)
 
(22,254
)
Long-term liabilities
(289
)
 
(276
)
 
(80
)
 
(74
)
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
March 31, 2015 (Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Recurring fair value measurements:
 
 
 
 
 
 
 
Available-for-sale securities
$
982

 
$
982

 
$
—

 
$
—

Derivative assets
131

 
—

 
131

 
—

Derivative liabilities
(610
)
 
—

 
(610
)
 
—

December 31, 2014 (Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Recurring fair value measurements:
 
 
 
 
 
 
 
Available-for-sale securities
$
961

 
$
961

 
$
—

 
$
—

Derivative assets
142

 
—

 
142

 
—

Derivative liabilities
(319
)
 
—

 
(319
)
 
—

Nonrecurring fair value measurements:
 
 
 
 
 
 
 
Business dispositions
3

 
—

 
3

 
—