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Employee Benefit Plans - Components of Expense/(Income) Related to Net Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Benefits    
Components of expense/ (income) related to net benefit expense:    
Service Cost Included in Labor and Fringe $ 8 $ 9
Interest Cost 26 23
Expected Return on Plan Assets (43) (44)
Amortization of Net Loss 7 10
Total (Income) Expense Included in Other Income - Net (10) (11)
Net Periodic Benefit (Credit) Cost (2) (2)
Other Post-retirement Benefits    
Components of expense/ (income) related to net benefit expense:    
Service Cost Included in Labor and Fringe 0 0
Interest Cost 1 2
Amortization of Prior Service Costs (2) 0
Total (Income) Expense Included in Other Income - Net (1) 2
Net Periodic Benefit (Credit) Cost $ (1) $ 2