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Supplementary Information
 12 Months Ended
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]  
Supplementary Information SUPPLEMENTARY INFORMATION
All Other Current Liabilities
All other current liabilities as of December 31, 2019 and 2018 include $1,121 million and $955 million, respectively, of employee related liabilities.
Product Warranties
We provide for estimated product warranty expenses when we sell the related products. Because warranty estimates are forecasts that are based on the best available information, primarily historical claims experience, claims costs may differ from amounts provided. An analysis of changes in the liability for product warranties are as follows:
 
2019
2018
Balance at beginning of year
$
236

$
164

Provisions
4

47

Expenditures
(14
)
(96
)
Other (1)
(6
)
121

Balance at end of year
$
220

$
236

(1) 
2018 amounts primarily related to the acquisition of BHI.
Allowance for doubtful accounts
The change in allowance for doubtful accounts is as follows:
 
2019
2018
Balance at beginning of year
$
327

$
330

Additions
48

47

Amounts written off
(42
)
(43
)
Other
(10
)
(7
)
Balance at end of year
$
323

$
327