Employee Benefits (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax
Total recognized	$ (231)	$ 101	$ 36
Retirement Plans [Member]
Components of net periodic cost for retirement plans and post-retirement plans
Service cost	10	24	67
Interest cost	91	93	99
Expected return on assets	(129)	(124)	(127)
Amortization of actuarial (gain) loss	26	32	31
Prior service credit	5	(1)	0
Curtailment	(8)	0	0
Net periodic benefit cost	(5)	24	70
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax
Net actuarial loss (gain)	(213)	116	65
Recognized actuarial gain	(15)	(20)	(18)
Amortization of prior service credit	5	2	0
Total recognized	(223)	98	47
Postretirement Plans [Member]
Components of net periodic cost for retirement plans and post-retirement plans
Service cost	2	3	3
Interest cost	5	5	6
Expected return on assets	0	0	0
Amortization of actuarial (gain) loss	0	0	0
Prior service credit	(1)	(1)	(1)
Curtailment	(12)	0	0
Net periodic benefit cost	(6)	7	8
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax
Net actuarial loss (gain)	(8)	2	(12)
Recognized actuarial gain	0	0	0
Amortization of prior service credit	0	1	1
Total recognized	$ (8)	$ 3	$ (11)