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Investments (Summarized Financial Information) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Selected statement of operations information:    
Revenues $ 286 $ 150
Costs of revenues 201 111
Operating income (loss) 12 (7)
Pre-tax income (loss) from continuing operations before extraordinary items 7 (16)
After-tax net income (loss) 4 (16)
Net income (loss) attributable to the entity $ 4 $ (16)