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Commitments (Tables)
 6 Months Ended
Jun. 30, 2018
Commitments  
Changes in warranty liabilities

 

Standard Warranty Liability

 

(Dollars in millions)

 

2018

 

2017

 

Balance at January 1

 

$
152

 

$
156

 

Current period accruals

 
61

 
74

 

Accrual adjustments to reflect actual experience

 
(24

)
(5

)

Charges incurred

 
(63

)
(84

)

 

 

 

 

 

 

Balance at June 30

 

$
126

 

$
141

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

 

(Dollars in millions)

 

2018

 

2017

 

Aggregate deferred revenue at January 1

 

$
566

 

$
531

 

Revenue deferred for new extended warranty contracts

 
111

 
125

 

Amortization of deferred revenue

 
(134

)
(137

)

Other*

 
(9

)
12

 

 

 

 

 

 

 

Aggregate deferred revenue at June 30

 

$
534

 

$
532

 

 

 

 

 

 

 

 

 

Current portion

 

$
254

 

$
231

 

Noncurrent portion

 

$
280

 

$
300

 

 

 

* Other primarily consists of foreign currency translation adjustments.