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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 10 | $ 17
Other intangible assets, accumulated amortization | 441 | 399
Service Concession Asset, Accumulated Depreciation | $ 206 | $ 114
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) | 816,312,913 | 816,061,123
Common stock, shares outstanding (in shares) | 660,388,128 | 659,182,232
Treasury stock, shares (in shares) | 155,924,785 | 156,878,891
Variable Interest Entity [Line Items] |  |
Non-recourse debt - current balance at variable interest entities | $ 2,164 | $ 1,052
Non-recourse debt - noncurrent, balance at variable interest entities | 13,176 | 13,731
Consolidated Variable Interest Entities [Member] |  |
Variable Interest Entity [Line Items] |  |
Non-recourse debt - current balance at variable interest entities | 1,012 | 273
Non-recourse debt - noncurrent, balance at variable interest entities | $ 1,358 | $ 1,502

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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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