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Commitments (Tables)
 3 Months Ended
Mar. 31, 2017
Commitments:  
Changes in warranty liabilities

Standard Warranty Liability

 

(Dollars in millions)

 

2017

 

2016

 

Balance at January 1

 

$
156

 

$
181

 

Current period accruals

 
32

 
27

 

Accrual adjustments to reflect actual experience

 
1

 
(2

)

Charges incurred

 
(41

)
(41

)

 

 

 

 

 

 

Balance at March 31

 

$
147

 

$
164

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

 

(Dollars in millions)

 

2017

 

2016

 

Aggregate deferred revenue at January 1

 

$
531

 

$
538

 

Revenue deferred for new extended warranty contracts

 
58

 
49

 

Amortization of deferred revenue

 
(68

)
(66

)

Other*

 
7

 
9

 

 

 

 

 

 

 

Aggregate deferred revenue at March 31

 

$
528

 

$
531

 

 

 

 

 

 

 

 

 

Current portion

 

$
250

 

$
247

 

Noncurrent portion

 

$
278

 

$
284

 

 

*

Other primarily consists of foreign currency translation adjustments.