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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 22 | $ 23
Other intangible assets, accumulated amortization | 389 | 457
Service Concession Asset, Accumulated Depreciation | $ 0 | $ 0
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) | 817,688,854 | 817,203,691
Common stock, shares outstanding (in shares) | 663,797,594 | 662,298,096
Treasury stock, shares (in shares) | 153,891,260 | 154,905,595
Variable Interest Entity [Line Items] |  |
Non Recourse Debt Non Current | $ 14,753 | $ 13,986
Non-recourse debt, including $333 and $479, respectively, related to variable interest entities | 1,087 | 1,659
Consolidated Variable Interest Entities [Member] |  |
Variable Interest Entity [Line Items] |  |
Non Recourse Debt Non Current | 3,339 | 2,922
Non-recourse debt, including $333 and $479, respectively, related to variable interest entities | $ 333 | $ 479

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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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