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Summary of Significant Accounting Policies Reconciliation of cash and cash equivalents (ASU 2016-18) (Tables) | 12 Months Ended
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Dec. 31, 2017
Reconciliation of cash and cash equivalents (ASU 2016-18) [Abstract] |
Reconciliation of cash and cash equivalents (2016-18) [Table Text Block] | The following table provides a reconciliation of cash and cash equivalents, program and restricted cash reported within the Consolidated Balance Sheets to the amounts shown in the Consolidated Statements of Cash Flows:
| As of December 31,
| 2017 |  | 2016
Cash and cash equivalents | $ | 611 |  |  | $ | 490 |
Program cash | 283 |  |  | 225 |
Restricted cash (a) | 7 |  |  | 5 |
Total cash and cash equivalents, program and restricted cash | $ | 901 |  |  | $ | 720 |
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(a) | Included within other current assets.

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