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Condensed Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivatives Qualifying as Hedges, Tax:        
Gain (loss) on derivatives qualifying as cash flow hedges, tax (benefit) $ 0 $ (2) $ 0 $ (7)
Less: Reclassification adjustment for loss on derivatives included in net income, tax expense (benefit) 0 (1) 0 (1)
Pension and Other Postretirement Benefit Plans, Tax:        
Changes in pension and postretirement benefits, tax (benefit) 0 (10) 0 (8)
Less: Amortization of prior service cost included in net periodic pension cost, net of tax (benefit) (1) (2) (2) (9)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]        
Changes in foreign currency translation, tax 0 0 0 0
Less: Translation loss realized upon sale of foreign equity method investment, net of tax (benefit) $ 0 $ 0 $ (2) $ 0