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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
(in millions)
 
Balance at
Beginning
of Year
 
Charged to
Costs and
Expenses
 
Charged to
Other
Accounts
 
Deductions
 
Balance at
End of
Year
Year ended December 31, 2019
 
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
47

 
$
10

 
$
(1
)
 
$
(8
)
 
$
48

Deferred tax asset valuation allowance
 
$
2,913

 
$
13

 
$
(95
)
 
$
—

 
$
2,831

Year ended December 31, 2018
 
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
97

 
$
4

 
$
(4
)
 
$
(50
)
 
$
47

Deferred tax asset valuation allowance
 
$
2,001

 
$
870

 
$
42

 
$
—

 
$
2,913

Year ended December 31, 2017
 
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
80

 
$
33

 
$
4

 
$
(20
)
 
$
97

Deferred tax asset valuation allowance
 
$
1,857

 
$
221

 
$
(77
)
 
$
—

 
$
2,001