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Business Segments (Corporate Items) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Amortization expense of acquired intangible assets $ 82 $ 62 $ 69
Restructuring Charges 41 172 0
Merger and strategic initiatives 76 10 81
Compensation and benefits 664 590 588
Regulatory 35 27 27
Operating income (loss) (839) (720) (754)
Corporate Items      
Segment Reporting Information [Line Items]      
Amortization expense of acquired intangible assets 82 62 69
Restructuring Charges 41 172 0
Merger and strategic initiatives 76 10 81
Regulatory 6 0 0
Sublease loss reserve (1) 0 11
Reversal of VAT refund receivables 0 12 0
Loss on extinguishment of debt 0 0 11
Other General Expense 5 0 5
Operating income (loss) 221 256 177
Corporate Items | Executive Officer      
Segment Reporting Information [Line Items]      
Compensation and benefits $ 12 $ 0 $ 0