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Financial Statement Presentation Cash, Cash Equivalents, and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2018
Cash and Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents [Table Text Block] | Cash, Cash Equivalents, and Restricted Cash — The following table provides a summary of cash, cash equivalents, and restricted cash amounts reported on the Condensed Consolidated Balance Sheet that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows (in millions):
| June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 1,140 |  |  | $ | 949 |
Restricted cash | 379 |  |  | 274 |
Debt service reserves and other deposits | 623 |  |  | 565 |
Cash, Cash Equivalents, and Restricted Cash | $ | 2,142 |  |  | $ | 1,788 |

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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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