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Commitments (Tables)
 3 Months Ended
Mar. 31, 2019
Commitments  
Changes in warranty liabilities

 

Standard Warranty Liability

 

(Dollars in millions)

 

2019

 

2018

 

Balance at January 1

 

$
118

 

$
152

 

Current period accruals

 
110

 
25

 

Accrual adjustments to reflect actual experience

 
(9

)
(14

)

Charges incurred

 
(111

)
(32

)

 

 

 

 

 

 

Balance at March 31

 

$
107

 

$
130

 

 

 

 

 

 

 

 

 

 

Extended Warranty Liability

 

(Dollars in millions)

 

2019

 

2018

 

Aggregate deferred revenue at January 1

 

$
533

 

$
566

 

Revenue deferred for new extended warranty contracts

 
36

 
46

 

Amortization of deferred revenue

 
(64

)
(69

)

Other*

 
(3

)
5

 

 

 

 

 

 

 

Aggregate deferred revenue at March 31

 

$
503

 

$
548

 

 

 

 

 

 

 

 

 

Current portion

 

$
242

 

$
260

 

Noncurrent portion

 

$
261

 

$
288

 

 

 

* Other primarily consists of foreign currency translation adjustments.