Income Taxes (Schedule Of Earnings Before Income Taxes And Provision For Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Before Income Taxes: [Abstract]
United States	$ 6,461	$ 5,568	$ 5,709
Outside United States	16	14	14
Earnings (loss) before income taxes	6,477	5,582	5,723
Provision for Income taxes [Abstract]
Federal - Current	2,870	2,353	1,430
State and local - Current	348	275	258
Outside United States - Current	5	4	4
Total current provision for income taxes	3,223	2,632	1,692
Federal - Deferred	(920)	(458)	120
State and local - Deferred	(9)	15	4
Total deferred provision for income taxes	(929)	(443)	124
Total provision for income taxes	$ 2,294	$ 2,189	$ 1,816