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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016, and 2015
($ in millions)
Balance at Beginning of Year

Charged to Costs and Expenses

Deductions(1)

Balance at End of Year

2017

$36


$15


($26
)

$25

2016

$43


$22


($29
)

$36

2015

$80


$10


($47
)

$43

(1)
Notes and accounts receivable written off as uncollectible, net of recoveries, amounts attributable to divestitures and changes attributable to foreign currency translation.