Income Taxes (Schedule Of Income Tax Expense/(Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	$ 2,102	$ 676	$ (82)
Non-U.S.	122	91	76
U.S. state	21	69	11
Total Current Income Tax Expense (Benefit)	2,245	836	5
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	(297)	828	1,531
Non-U.S.	4	34	41
U.S. state	27	(7)	69
Total deferred	(266)	855	1,641
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total income tax expense	$ 1,979	$ 1,691	$ 1,646