Segment Reporting - Reconciliation Of Operating Profit (Loss) (Details) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciling items:
Total Segment Profit (Loss)		$ 422,000,000	$ 417,000,000	$ 196,000,000
Goodwill, Impairment Loss	$ 0	0	0	935,000,000
Restructuring and related costs		81,000,000	101,000,000	101,000,000
Interest expense		112,000,000	137,000,000	40,000,000
Depreciation and amortization		242,000,000	243,000,000	280,000,000
Litigation costs (recoveries), net		227,000,000	(11,000,000)	40,000,000
Separation costs		0	12,000,000	44,000,000
Gain (Loss) on Extinguishment of Debt		(108,000,000)	0	0
Other Operating Income (Expense), Net		(5,000,000)	7,000,000	22,000,000
Segment Pre-Tax Income (Loss)		(395,000,000)	(16,000,000)	(1,227,000,000)
Business transformation costs		0	0	3,000,000
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets		221,000,000	254,000,000	333,000,000
NY MMIS Depreciation		0	0	(52,000,000)
NY MMIS		(2,000,000)	9,000,000	161,000,000
HE charge		(1,000,000)	(8,000,000)	0
(Gain) loss on divestitures and transaction costs		(42,000,000)	42,000,000	(2,000,000)
Segment Adjusted EBITDA		$ 640,000,000	$ 672,000,000	$ 635,000,000

Business transformation costs - Business transformation costs represent incremental costs incurred directly in support of our business transformation and restructuring initiatives such as compensation costs for overlapping staff, consulting costs and training costs.

No definition available.