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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Mar. 31, 2018
Income Tax Disclosure [Line Items]            
Undistributed earnings   $ 387        
Income tax benefits primarily related to share-based compensation   9 $ 40 $ 41    
Unrecognized tax benefits that would impact effective tax rate $ 45 43 45 48    
decrease in unrecognized tax benefits, reasonably possible   12        
Penalties and interest expense   2 1 $ 2    
Interest and penalties related to income tax 9 10 9      
Payments for tax settlements   40        
Provisional tax benefit, due to Tax Cuts and Jobs Act $ 89   $ (89)      
Reduction to deferred tax assets relating to foreign currency translation   (290)        
Foreign Tax Authority | Sweden            
Income Tax Disclosure [Line Items]            
Tax expense (benefits) associated with foreign tax agency         $ 41 $ (56)
Tax expense (benefits), per diluted share (in dollars per share)         $ 0.24  
Quarterly recurring tax expense   1        
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02            
Income Tax Disclosure [Line Items]            
Reclassification from AOCI, tax amount   (417)        
Retained Earnings | Accounting Standards Update 2018-02            
Income Tax Disclosure [Line Items]            
Reclassification from AOCI, tax amount   $ 417