Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
In accordance with the provisions of ASC 820, the following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring and nonrecurring basis in our Condensed Consolidated Balance Sheet as of September 30, 2016 and December 31, 2015: 
September 30, 2016 (Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Recurring fair value measurements:
 
 
 
 
 
 
 
Available-for-sale securities
$
1,005

 
$
1,005

 
$
—

 
$
—

Derivative assets
101

 
—

 
101

 
—

Derivative liabilities
(181
)
 
—

 
(181
)
 
—


December 31, 2015 (Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Recurring fair value measurements:
 
 
 
 
 
 
 
Available-for-sale securities
$
951

 
$
951

 
$
—

 
$
—

Derivative assets
101

 
—

 
101

 
—

Derivative liabilities
(533
)
 
—

 
(533
)
 
—
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value in our Condensed Consolidated Balance Sheet at September 30, 2016 and December 31, 2015:
 
September 30, 2016
 
December 31, 2015
(Dollars in millions)
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Long-term receivables
$
136

 
$
129

 
$
122

 
$
107

Customer financing notes receivable
459

 
430

 
403

 
403

Short-term borrowings
(871
)
 
(871
)
 
(926
)
 
(926
)
Long-term debt (excluding capitalized leases)
(21,774
)
 
(24,938
)
 
(19,476
)
 
(21,198
)
Long-term liabilities
(427
)
 
(397
)
 
(458
)
 
(419
)

The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet as of September 30, 2016:
(Dollars in millions)
Total
 
Level 1
 
Level 2
 
Level 3
Long-term receivables
$
129

 
$
—

 
$
129

 
$
—

Customer financing notes receivable
430

 
—

 
430

 
—

Short-term borrowings
(871
)
 
—

 
(780
)
 
(91
)
Long-term debt (excluding capitalized leases)
(24,938
)
 
—

 
(24,752
)
 
(186
)
Long-term liabilities
(397
)
 
—

 
(397
)
 
—