Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Contribution Plans	$ 80	$ 80	$ 170	$ 183
Discontinued Operations Defined Benefit Plan Recognized Net Gain Due To Settlements And Curtailments		(19)		(24)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans	60	22	144	51
Service Cost	122	142	244	286
Interest Cost	380	343	760	686
Expected Return on Plan Assets	(554)	(526)	(1,108)	(1,053)
Amortization	(2)	(9)	(4)	(18)
Recognized actuarial net loss (gain)	107	240	214	480
Net settlement and curtailment loss (gain)	6	(14)	6	(17)
Total net periodic benefit cost	59	176	112	364
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	1	2	2
Interest Cost	10	9	20	19
Expected Return on Plan Assets	0	0	0	0
Amortization	0	(3)	0	(6)
Recognized actuarial net loss (gain)	(1)	(1)	(2)	(2)
Net settlement and curtailment loss (gain)	0	0	0	0
Total net periodic benefit cost	10	6	20	13
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