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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Operating Loss Carryforwards [Line Items]          
Payments for tax settlements     $ 40    
Adjustment to tax expense $ (4) $ 5   $ (89)  
Sweden | Foreign Tax Authority          
Operating Loss Carryforwards [Line Items]          
Tax expense (benefits) associated with foreign tax agency   57     $ 41
Tax expense (benefits), per diluted share (in dollars per share)         $ 0.24
Quarterly recurring tax benefits     $ 1    
Retained Earnings | Accounting Standards Update 2018-02          
Operating Loss Carryforwards [Line Items]          
Reclassification from AOCI, tax amount   142      
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02          
Operating Loss Carryforwards [Line Items]          
Reclassification from AOCI, tax amount   (142)      
Employee Benefit Plan Adjustment Gains And Losses | Accounting Standards Update 2018-02          
Operating Loss Carryforwards [Line Items]          
Reclassification from AOCI, tax amount   (135)      
Net Foreign Currency Transaction Gains And Losses | Accounting Standards Update 2018-02          
Operating Loss Carryforwards [Line Items]          
Reclassification from AOCI, tax amount   $ (7)