Earnings Per Share (Schedule Of Weighted-Average Number Of Shares Outstanding Used To Compute Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net earnings	$ 1,026	$ 1,704	$ 1,110	$ 1,336	$ 1,466	$ 1,362	$ 1,653	$ 965	$ 5,176	$ 5,446	$ 4,585
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									4	6	7
Net earnings available to common shareholders									$ 5,172	$ 5,440	$ 4,578
Basic weighted average shares outstanding									688.0	728.9	760.8
Participating securities									1.1	1.3	1.9
Basic weighted average common shares outstanding									686.9	727.6	758.9
Basic weighted average shares outstanding									688.0	728.9	760.8
Dilutive potential common shares									8.1	9.1	8.7
Dilutive weighted average shares outstanding									696.1	738.0	769.5
Participating securities									1.1	1.3	1.9
Diluted weighted average common shares outstanding									695.0	736.7	767.6
Income (Loss) from Continuing Operations, Per Basic Share									$ 7.52	$ 7.47	$ 6.03
Income (Loss) from Continuing Operations, Per Diluted Share									$ 7.44	$ 7.38	$ 5.96