Income Taxes (Schedule Of Income Tax Expense/(Benefit)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Current tax expense			$ (534)	$ (44)	$ 82
Deferred tax expense			1,916	1,240	314
Total income tax expense	397	371	1,382	1,196	396
U.S. Federal [Member]
Income Taxes [Line Items]
Current tax expense			(605)	13	(132)
Deferred tax expense			1,856	969	457
Non-U.S. [Member]
Income Taxes [Line Items]
Current tax expense			93	80	69
Deferred tax expense			(8)	(13)	(55)
U.S. State [Member]
Income Taxes [Line Items]
Current tax expense			(22)	(137)	145
Deferred tax expense			$ 68	$ 284	$ (88)