Employee Benefit Plans (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits [Member]
Component of periodic benefit cost
Service cost	$ 0	$ 0
Interest cost	64	60
Expected return on plan assets	(81)	(79)
Amortization of prior service credit	0	0
Amortization of actuarial loss	11	14
Net periodic benefit cost	(6)	(5)
Other Postretirement Benefits [Member]
Component of periodic benefit cost
Service cost	0	0
Interest cost	3	3
Expected return on plan assets	(4)	(3)
Amortization of prior service credit	(2)	(2)
Amortization of actuarial loss	1	0
Net periodic benefit cost	$ (2)	$ (2)