Quaterly Information (Details) (USD $) In Millions, unless otherwise specified	3 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, 2012	Dec. 31, 2011	Dec. 31, 2010
Selected Quarterly Financial Information [Abstract]
Revenues	$ 11,770	$ 11,369	$ 11,458	$ 11,442	$ 11,577	$ 12,015	$ 12,440	$ 13,036	$ 46,039	$ 49,068	$ 49,856
Earnings from continuing operations	1,949	1,777	2,238	1,991	1,763	1,616	1,981	2,250	7,955	7,610	2,151
Benefit (provision) for income taxes	(124)	(78)	(102)	(187)	(65)	(59)	(346)	(429)	(491)	(899)	985
Earnings from continuing operations	1,825	1,699	2,136	1,804	1,698	1,557	1,635	1,821	7,464	6,711	3,136
Losses from discontinued operations, net of tax	(305)	(111)	(553)	(217)	(240)	(64)	195	35	(1,186)	(74)	(965)
Net earnings	1,520	1,588	1,583	1,587	1,458	1,493	1,830	1,856	6,278	6,637	2,171
Less net earnings (loss) attributable to noncontrollng interests	(17)	(20)	(14)	(12)	(38)	(38)	(20)	(31)	(63)	(127)	(16)
Net earnings (loss) attributable to the Company	$ 1,503	$ 1,568	$ 1,569	$ 1,575	$ 1,420	$ 1,455	$ 1,810	$ 1,825	$ 6,215	$ 6,510	$ 2,155