Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Contribution Plans	$ 80,000,000	$ 56,000,000	$ 183,000,000	$ 118,000,000
Discontinued Operations Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments	(19,000,000)	3,000,000	(24,000,000)	24,000,000
Business Acquisition Pension And Post Retirement Obligations Assumed	1,500,000,000		1,500,000,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans	22,000,000	11,000,000	51,000,000	24,000,000
Defined Benefit Plan, Service Cost	142,000,000	115,000,000	286,000,000	230,000,000
Defined Benefit Plan, Interest Cost	343,000,000	313,000,000	686,000,000	626,000,000
Defined Benefit Plan, Expected Return on Plan Assets	(526,000,000)	(456,000,000)	(1,053,000,000)	(912,000,000)
Defined Benefit Plan, Amortization of Transition Obligations, Assets and Prior Service Cost Credit	(9,000,000)	(3,000,000)	(18,000,000)	(6,000,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	240,000,000	180,000,000	480,000,000	361,000,000
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements and Curtailments	(14,000,000)	7,000,000	(17,000,000)	35,000,000
Defined Benefit Plan, Net Periodic Benefit Cost	176,000,000	156,000,000	364,000,000	334,000,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,000,000	1,000,000	2,000,000	2,000,000
Defined Benefit Plan, Interest Cost	9,000,000	8,000,000	19,000,000	16,000,000
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Transition Obligations, Assets and Prior Service Cost Credit	(3,000,000)	0	(6,000,000)	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	(1,000,000)	(2,000,000)	(2,000,000)	(4,000,000)
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements and Curtailments	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	6,000,000	7,000,000	13,000,000	14,000,000
United States Pension Plans Of US Entity Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans			$ 0