Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Contribution Plans	$ 79	$ 75	$ 249	$ 258
Discontinued Operations Defined Benefit Plan Recognized Net Gain Due To Settlements And Curtailments				(24)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans	60	21	204	72
Service Cost	122	142	366	428
Interest Cost	381	343	1,141	1,029
Expected Return on Plan Assets	(555)	(526)	(1,663)	(1,579)
Amortization	(3)	(8)	(7)	(26)
Recognized actuarial net loss (gain)	108	237	322	717
Net settlement and curtailment loss (gain)	2	0	8	(17)
Total net periodic benefit cost	55	188	167	552
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	1	3	3
Interest Cost	10	9	30	28
Expected Return on Plan Assets	0	0	0	0
Amortization	0	(2)	0	(8)
Recognized actuarial net loss (gain)	(1)	(1)	(3)	(3)
Net settlement and curtailment loss (gain)	0	0	0	0
Total net periodic benefit cost	10	7	30	20
United States Pension Plans Of US Entity Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans	$ 0	$ 0	$ 0	$ 0