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Business Segments (Corporate Items) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues - divested businesses		$ 964	$ 965	$ 3,141	$ 2,929
Expenses:
Amortization expense of acquired intangible assets		27	22	83	67
Merger and strategic initiatives expense		6	3	7	20
Clearing default loss	$ 8
Extinguishment of debt				0	(9)
Operating loss		246	262	787	750
Corporate Items
Segment Reporting Information [Line Items]
Revenues - divested businesses		0	46	56	143
Expenses:
Amortization expense of acquired intangible assets		27	22	83	67
Merger and strategic initiatives expense		6	3	7	20
Extinguishment of debt		0	0	0	10
Expenses - divested businesses		0	42	51	125
Other		2	1	6	2
Total expenses		43	68	155	224
Operating loss		(43)	(22)	(99)	(81)
Liability Waterfall
Expenses:
Clearing default loss	$ 8	$ 8	$ 0	$ 8	$ 0

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Gain (Loss) Due To Commodities Market Default Allocated To Junior Capital

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Total costs of sales and operating expenses for the period.

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