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Income Taxes - Allocation of Income Tax Expense Benefit (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Interperiod Allocaion [Line Items]
Pre-tax income		$ 21	$ (193)	$ (244)
Discontinued Operation, Tax Effect of Discontinued Operation	[1]	0	3	0
Stock option and incentive plans, net		0	0	0
Total Income Tax Expense (Benefit)		21	(190)	(236)
Defined Benefit Pension Plans, Defined Benefit [Member]
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax		$ 0	$ 0	$ 8
[1] Year Ended December 31,(in millions) 2018 2017 2016Pre-tax income $21 $(193) $(244)Discontinued operations — 3 —Common shareholders' equity: Changes in defined benefit plans — — 8Stock option and incentive plans, net — — —Total Income Tax Expense (Benefit) $21 $(190) $(236)

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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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