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Condensed Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivatives Qualifying as Hedges, Tax:        
Loss on derivatives qualifying as cash flow hedges, tax (benefit) $ 0 $ (2) $ 0 $ (5)
Less: Reclassification adjustment for loss on derivatives included in net income, tax expense (benefit) 0 0 0 0
Pension and Other Postretirement Benefit Plans, Tax:        
Changes in pension and postretirement benefits, tax (benefit) 0 2 0 2
Net reclassification in AOCI for amortization of prior service cost included other net periodic postretirement benefit 0 (7) (1) (7)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]        
Translation loss realized upon sale of foreign equity method investment, tax (2) 0 (2) 0
Changes in foreign currency translation, tax $ 0 $ 0 $ 0 $ 0