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Income Taxes - Unrecognized Tax Benefits, Including Attributable to Discontinued Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Expense (Benefit) [Rollforward]    
Balance at January 1 $ 76 $ 68
Additions based on tax positions related to current year 4 10
Additions for tax positions of prior years 1 22
Reductions for tax positions of prior years 0 (1)
Settlements and agreements (2) (20)
Lapse of statute of limitations (3) (3)
Balance at December 31 $ 76 $ 76