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Employee Benefit Plans (Retirement Plan Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plans $ 52 $ 50 $ 44
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost (benefits earned during the period) 92 71 84
Interest cost 112 126 114
Expected return on plan assets (129) (155) (144)
Settlement charges 60 95 0
Amortization of actuarial loss 69 36 74
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2 3 3
Net periodic defined benefit plan expense 206 176 131
Pension Expense 258 226 175
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost (benefits earned during the period) 5 4 5
Interest cost 8 8 7
Amortization of actuarial loss 7 2 5
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (17) (18) (18)
Net periodic defined benefit plan expense 3 (4) (1)
Pension Expense $ 3 $ (4) $ (1)