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Business Segments (Corporate Items) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]        
Revenues - divested businesses   $ 4,277 $ 3,948 $ 3,704
Expenses:        
Amortization expense of acquired intangible assets   109 92 82
Merger and strategic initiatives expense   21 44 76
Clearing default $ 8      
Extinguishment of debt   0 (9) 0
Restructuring charges   0 0 41
Regulatory matter   32 33 35
Expenses - divested businesses   1,498 1,420 1,440
Executive compensation   712 670 665
Operating income   1,028 991 836
Corporate Items        
Segment Reporting Information [Line Items]        
Revenues - divested businesses   56 194 191
Expenses:        
Amortization expense of acquired intangible assets   109 92 82
Merger and strategic initiatives expense   21 44 76
Clearing default   31 0 0
Extinguishment of debt   0 10 0
Restructuring charges   0 0 41
Regulatory matter   0 0 6
Expenses - divested businesses   51 167 168
Executive compensation   0 0 12
Other   17 4 6
Total expenses   229 317 391
Operating income   $ (173) $ (123) $ (200)