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Commitments (Tables)
 9 Months Ended
Sep. 30, 2018
Commitments  
Changes in warranty liabilities

 

Standard Warranty Liability

 

(Dollars in millions)

 

2018

 

2017

 

Balance at January 1

 

$
152

 

$
156

 

Current period accruals

 
84

 
107

 

Accrual adjustments to reflect actual experience

 
(31

)
(3

)

Charges incurred

 
(93

)
(126

)

 

 

 

 

 

 

Balance at September 30

 

$
112

 

$
134

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

 

(Dollars in millions)

 

2018

 

2017

 

Aggregate deferred revenue at January 1

 

$
566

 

$
531

 

Revenue deferred for new extended warranty contracts

 
138

 
175

 

Amortization of deferred revenue

 
(178

)
(198

)

Other*

 
(12

)
24

 

 

 

 

 

 

 

Aggregate deferred revenue at September 30

 

$
514

 

$
533

 

 

 

 

 

 

 

 

 

Current portion

 

$
242

 

$
258

 

Noncurrent portion

 

$
273

 

$
275

 

 

* Other primarily consists of foreign currency translation adjustments.