Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 0	$ 0
Interest Cost	232	215
Expected Return on Plan Assets	(207)	(184)
Amortization of Prior Service Benefit	0	0
Recognized net actuarial loss	34	56
Settlements	0	6
Net periodic cost	59	93
Other Postretirement and Postemployment Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	13	12
Interest Cost	39	36
Expected Return on Plan Assets	(21)	(21)
Amortization of Prior Service Benefit	(7)	(7)
Recognized net actuarial loss	1	6
Settlements	0	0
Net periodic cost	$ 25	$ 26