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Intangible Assets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill
Balance, beginning of period	$ 370
Loss on impairment	(370)
Balance, end of period	0
Licenses
Licenses
Balance, beginning of period	1,886
Acquisitions	331
Transferred to Assets held for sale	(5)
Exchanges - Licenses received	18
Exchanges - Licenses surrendered	(5)
Balance, end of period	$ 2,225

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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X

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The increase (decrease) during the period in book value of long-lived assets that the reporting entity plans to sell within one year (or one business cycle).

+ References

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-Publisher FASB
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