Employee Benefit Plans (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 1,128
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	1,136
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	1,154
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	1,175
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	1,194
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	6,226
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	272
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	272
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	273
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	270
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	264
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 1,311