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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)