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Commitments (Tables)
9 Months Ended
Sep. 30, 2021
Commitments  
Changes in warranty liabilities

Standard Warranty Liability

​

​

​

​

​

​

​

(Dollars in millions)

    

2021

    

2020

Balance at January 1

​

$

83

​

$

113

Current period accruals

​

 

50

​

 

56

Accrual adjustments to reflect actual experience

​

 

(2)

​

 

(15)

Charges incurred

​

 

(66)

​

 

(73)

Balance at September 30

​

$

66

​

$

80

​

Extended Warranty Liability

​

​

​

​

​

​

​

(Dollars in millions)

    

2021

    

2020

Balance at January 1

​

$

425

​

$

477

Revenue deferred for new extended warranty contracts

​

 

71

​

 

115

Amortization of deferred revenue

​

 

(154)

​

 

(169)

Other*

​

 

(9)

​

 

(3)

Balance at September 30

​

$

334

​

$

419

Current portion

​

$

171

​

$

196

Noncurrent portion

​

$

163

​

$

223

* Other primarily consists of foreign currency translation adjustments.