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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan expenses $ 82 $ 79 $ 77
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions 28    
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions $ 5    
Minimum | Equity investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 15.00%    
Minimum | Fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 75.00%    
Minimum | Other plan assets      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 0.00%    
Maximum | Equity investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 25.00%    
Maximum | Fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 85.00%    
Maximum | Other plan assets      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage 10.00%    
United States | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Employer discretionary contribution amount   $ 115