Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 510,000,000	$ 182,000,000	$ 284,000,000	$ 399,000,000	$ 80,000,000	$ 460,000,000	$ 381,000,000	$ 578,000,000	$ 732,000,000	$ 345,000,000	$ 692,000,000	$ 540,000,000	$ 1,223,000,000	$ 2,036,000,000	$ 1,930,000,000
Average shares outstanding											660	669	665	642	643
Basic earnings per share	$ 0.77	$ 0.28	$ 0.43	$ 0.60	$ 0.12	$ 0.68	$ 0.59	$ 0.91	$ 1.15	$ 0.54	$ 1.05	$ 0.81	$ 1.84	$ 3.17	$ 3.00
Plus: After-tax interest on 4.7% debentures related to $1.75 billion Equity Units														13,000,000
Adjusted net earnings attributable to controlling interests											692,000,000	540,000,000	1,223,000,000	2,049,000,000	1,930,000,000
Share-based compensation awards											1	1	1	1	1
Shares assumed issued related to $1.75 billion equity units								44						11
Adjusted average shares outstanding											661	670	666	654	644
Diluted earnings per share	$ 0.77	$ 0.28	$ 0.43	$ 0.60	$ 0.12	$ 0.68	$ 0.58	$ 0.86	$ 1.14	$ 0.54	$ 1.05	$ 0.81	$ 1.84	$ 3.13	$ 3.00
After-tax interest on debentures					4.70%							4.70%
Face amount of equity units					$ 1,750,000,000			$ 1,750,000,000				$ 1,750,000,000