Year Ended September 30, | 2013 | 2012 | 2011 | ||||||||
Accounts Receivable - Allowance for Doubtful Accounts | |||||||||||
Balance at beginning of period | $ | 78 | $ | 89 | $ | 96 | |||||
Provision charged to costs and expenses | 68 | 47 | 37 | ||||||||
Reserve adjustments | (50 | ) | (15 | ) | (23 | ) | |||||
Accounts charged off | (27 | ) | (42 | ) | (24 | ) | |||||
Acquisition of businesses | 1 | — | 4 | ||||||||
Divestiture of businesses | (1 | ) | — | — | |||||||
Currency translation | — | (1 | ) | (1 | ) | ||||||
Transfers to held for sale | (1 | ) | — | — | |||||||
Balance at end of period | $ | 68 | $ | 78 | $ | 89 | |||||
Deferred Tax Assets - Valuation Allowance | |||||||||||
Balance at beginning of period | $ | 766 | $ | 719 | $ | 739 | |||||
Allowance provision for new operating and other loss carryforwards | 165 | 119 | 95 | ||||||||
Acquisition of businesses | — | — | 18 | ||||||||
Allowance provision (benefit) adjustments | 250 | (72 | ) | (133 | ) | ||||||
Transfers to held for sale | (9 | ) | — | — | |||||||
Balance at end of period | $ | 1,172 | $ | 766 | $ | 719 | |||||