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Revenues (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Revenue, Performance Obligation, Description of Payment Terms |  | 45 |
Revenue, Remaining Performance Obligation |  | $ 2,200 | $ 2,100
Revenue Recognized on Deferred Revenues |  | 200 |
Contracted Amounts Receivable from Customers, Current | [1] | 2,039 |
Contracted Amounts Receivable from Customers, in Two Years | [1] | 3,829 |
Contracted Amounts Receivable from Customers, in Three Years | [1] | 3,552 |
Contracted Amounts Receivable from Customers, in Four Years | [1] | 3,279 |
Contracted Amounts Receivable from Customers, in Five Years | [1] | 3,054 |
Contracted Amounts Receivable from Customers, Thereafter | [1] | 6,928 |
Contracted Amounts Receivable from Customers, Total | [1] | 22,681 |
Non-current |  |  |
Assets Related to Straight Line Site Rental Revenues |  | 1,300 |
Current |  |  |
Assets Related to Straight Line Site Rental Revenues |  | $ 121 |
[1] | Excludes amounts related to network services, as those contracts generally have a duration of one year or less.

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