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Commitments (Tables)
 9 Months Ended
Sep. 30, 2017
Commitments:  
Changes in warranty liabilities

Standard Warranty Liability

 

(Dollars in millions)

 

2017

 

2016

 

Balance at January 1

 

$
156

 

$
181

 

Current period accruals

 
107

 
107

 

Accrual adjustments to reflect actual experience

 
(3

)
4

 

Charges incurred

 
(126

)
(132

)

 

 

 

 

 

 

Balance at September 30

 

$
134

 

$
160

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

 

(Dollars in millions)

 

2017

 

2016

 

Aggregate deferred revenue at January 1

 

$
531

 

$
538

 

Revenue deferred for new extended warranty contracts

 
175

 
176

 

Amortization of deferred revenue

 
(198

)
(198

)

Other*

 
24

 
12

 

 

 

 

 

 

 

Aggregate deferred revenue at September 30

 

$
533

 

$
528

 

 

 

 

 

 

 

 

 

Current portion

 

$
258

 

$
287

 

Noncurrent portion

 

$
275

 

$
241

 

 

* Other primarily consists of foreign currency translation adjustments.