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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 134 | $ 195
Other intangible assets, accumulated amortization | 153 | 222
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 1,200,000,000 | 1,200,000,000
Common stock, shares issued (in shares) | 813,316,510 | 810,679,839
Common stock, shares outstanding (in shares) | 722,508,342 | 744,263,855
Treasury stock, shares (in shares) | 90,808,168 | 66,415,984
Variable Interest Entity [Line Items] |  |
Non-recourse debt - current balance at variable interest entities | 2,062 | 2,494
Non-recourse debt - noncurrent, balance at variable interest entities | 13,318 | 12,265
Consolidated Variable Interest Entities [Member] |  |
Variable Interest Entity [Line Items] |  |
Non-recourse debt - current balance at variable interest entities | 267 | 275
Non-recourse debt - noncurrent, balance at variable interest entities | $ 979 | $ 858

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- Definition The current portion of the entity's non-recourse debt. Non-recourse debt is secured by the capital stock, physical assets, contracts and cash flows of the related subsidiary. The risk is limited to the respective subsidiary business and is without recourse to the Parent Company and other subsidiaries. + References No definition available. + Details
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