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Commitments (Tables)
 3 Months Ended
Mar. 31, 2018
Commitments  
Changes in warranty liabilities

Standard Warranty Liability

(Dollars in millions)

 

2018

 

2017

 

Balance at January 1

 

$
152

 

$
156

 

Current period accruals

 
25

 
32

 

Accrual adjustments to reflect actual experience

 
(14

)
1

 

Charges incurred

 
(32

)
(41

)

 

 

 

 

 

 

Balance at March 31

 

$
130

 

$
147

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

(Dollars in millions)

 

2018

 

2017

 

Aggregate deferred revenue at January 1

 

$
566

 

$
531

 

Revenue deferred for new extended warranty contracts

 
46

 
58

 

Amortization of deferred revenue

 
(69

)
(68

)

Other*

 
5

 
7

 

 

 

 

 

 

 

Aggregate deferred revenue at March 31

 

$
548

 

$
528

 

 

 

 

 

 

 

 

 

Current portion

 

$
260

 

$
250

 

Noncurrent portion

 

$
288

 

$
278

 

 

*Other primarily consists of foreign currency translation adjustments.