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Receivables, net (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Rollforward of Allowance for Doubtful Accounts | The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance. Activity in the allowance for doubtful accounts was as follows (in millions):
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 34 |  |  | $ | 38 |  |  | $ | 19 |
Additions charged to expenses |  |  | 3 |  |  |  | 17 |  |  |  | 27 |
Charge-offs and other |  |  | (8 | ) |  |  | (21 | ) |  |  | (8 | )
Ending balance |  | $ | 29 |  |  | $ | 34 |  |  | $ | 38 |

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- Definition Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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