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Fair Values (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets Measured On Recurring Basis Financial Statement Captions [Line Items]
Impairment Of Goodwill Prepaid Services		$ 219
Impairment Charge - Technology And Other Assets writedown to Fair Value		165
Goodwill and intangible asset impairment	$ 0	384	$ 0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets Measured On Recurring Basis Financial Statement Captions [Line Items]
Assets measured at fair value for impairment	$ 0	$ 0

X

- Definition

Impairment Charge related to balances of goodwill in the Prepaid Services business

+ References

No definition available.

+ Details

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- Definition

Balances representing the impairment charge of Technology and Other Assets to fair value

+ References

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+ Details

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

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