Employee Benefit Plans - Plan Amendments and Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Recognized curtailment gain	$ 0	$ 0	$ 107,000,000
Pension Curtailment Gain, Net of Tax			66,000,000
Pension plan amendment, remaining service period for participants			10 years
Pension plan amendment, average remaining life expectancy of all participants			33 years
Pension plan amendment, aggregate accumulated actuarial losses for U.S. plans		1,100,000,000
Pension plan reduction in pension expense	45,000,000
Defined benefit plan global plan assets at measurement dates	$ 8,700,000,000	$ 9,000,000,000