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Commitments (Tables)
9 Months Ended
Sep. 30, 2019
Commitments  
Changes in warranty liabilities

Standard Warranty Liability

(Dollars in millions)

    

2019

    

2018

Balance at January 1

$

118

$

152

Current period accruals

 

66

 

84

Accrual adjustments to reflect actual experience

 

(1)

 

(31)

Charges incurred

 

(86)

 

(93)

Balance at September 30

$

98

$

112

Extended Warranty Liability

(Dollars in millions)

    

2019

    

2018

Aggregate deferred revenue at January 1

$

533

$

566

Revenue deferred for new extended warranty contracts

 

124

 

138

Amortization of deferred revenue

 

(194)

 

(178)

Other*

 

(8)

 

(12)

Aggregate deferred revenue at September 30

$

455

$

514

Current portion

$

226

$

242

Noncurrent portion

$

230

$

273

* Other primarily consists of foreign currency translation adjustments.