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Income Taxes (Unrecognized Tax Benefits, Including Those Attributable To Discontinued Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit) [Rollforward]    
Balance at January 1 $ 88 $ 96
Additions based on tax positions related to current year 0 2
Additions for tax positions of prior years 2 4
Reductions for tax positions of prior years (15) (9)
Settlements and agreements (3) (3)
Lapse of statute of limitations (4) (2)
Balance at December 31 $ 68 $ 88