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Commitments (Tables)
3 Months Ended
Mar. 31, 2020
Commitments  
Changes in warranty liabilities

Standard Warranty Liability

​

​

​

​

​

​

​

(Dollars in millions)

    

2020

    

2019

Balance at January 1

​

$

113

​

$

118

Current period accruals

​

 

20

​

 

19

Accrual adjustments to reflect actual experience

​

 

(6)

​

 

(1)

Charges incurred

​

 

(26)

​

 

(29)

Balance at March 31

​

$

100

​

$

107

​

Extended Warranty Liability

​

​

​

​

​

​

​

(Dollars in millions)

    

2020

    

2019

Balance at January 1

​

$

477

​

$

533

Revenue deferred for new extended warranty contracts

​

 

40

​

 

36

Amortization of deferred revenue

​

 

(57)

​

 

(64)

Other*

​

 

(13)

​

 

(3)

Balance at March 31

​

$

447

​

$

503

Current portion

​

$

219

​

$

242

Noncurrent portion

​

$

228

​

$

261

* Other primarily consists of foreign currency translation adjustments.