Fair Values (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2016
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	384
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