v3.4.0.3
Employee Benefit Plans (Net Periodic Benefit Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Components of Net Periodic Benefit Expense (Income)    
Service cost, benefits earned during the period $ 4 $ 5
Interest cost on projected benefit obligation 38 39
Expected return on plan assets (30) (30)
Net amortization of prior service cost (4) (5)
Net amortization of actuarial loss 3 6
Net periodic benefit expense (income) $ 11 $ 15