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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
Allowance for Doubtful Accounts for the Years Ended December 31, 2016, 2015, and 2014
($ in millions)
Balance at
Beginning
of Year
Charged to
Costs and
Expenses
Other Additions(1)
Deductions(2)
Balance at
End of
Year
2016
$
46

$
22

$
—

$
(29
)
$
39

2015
$
81

$
10

$
—

$
(45
)
$
46

2014
$
68

$
16

$
31

$
(34
)
$
81

(1)
Represents allowance for doubtful accounts of acquired businesses.
(2)
Notes and accounts receivable written off as uncollectible, net of recoveries, amounts attributable to divestitures and changes attributable to foreign currency translation.