Income Taxes (Provision For Federal And Foreign Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Federal income taxes:
Current	$ 912	$ 600	$ 677
Deferred	9	561	557
Total federal income taxes	921	1,161	1,234
Foreign income taxes:
Current	38	8	(4)
Deferred	5	(5)	(15)
Total foreign income taxes	43	3	(19)
Income tax expense	$ 964	$ 1,164	$ 1,215