Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Contribution Plans	$ 75,000,000	$ 65,000,000	$ 258,000,000	$ 183,000,000
Discontinued Operations Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments	0		(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	21,000,000	209,000,000	72,000,000	233,000,000
Defined Benefit Plan, Service Cost	142,000,000	131,000,000	428,000,000	361,000,000
Defined Benefit Plan, Interest Cost	343,000,000	344,000,000	1,029,000,000	970,000,000
Defined Benefit Plan, Expected Return on Plan Assets	(526,000,000)	(503,000,000)	(1,579,000,000)	(1,415,000,000)
Defined Benefit Plan, Amortization of Transition Obligations, Assets and Prior Service Cost Credit	(8,000,000)	(7,000,000)	(26,000,000)	(13,000,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	237,000,000	180,000,000	717,000,000	541,000,000
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements and Curtailments	0	15,000,000	(17,000,000)	50,000,000
Defined Benefit Plan, Net Periodic Benefit Cost	188,000,000	160,000,000	552,000,000	494,000,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,000,000	1,000,000	3,000,000	3,000,000
Defined Benefit Plan, Interest Cost	9,000,000	10,000,000	28,000,000	26,000,000
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	(2,000,000)	(2,000,000)	(8,000,000)	(2,000,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(1,000,000)	(1,000,000)	(3,000,000)	(5,000,000)
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements and Curtailments	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	7,000,000	8,000,000	20,000,000	22,000,000
United States Pension Plans Of US Entity Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Plans			$ 0	$ 201,000,000