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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net earnings		$ 3,132	$ 1,853	$ 1,761	$ 1,451	$ 1,631	$ 2,279	$ (234)	$ 1,219	$ 8,197	$ 4,895	$ 5,176
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic										6	3	4
Net earnings available to common shareholders										$ 8,191	$ 4,892	$ 5,172
Basic weighted average shares outstanding										603.2	636.5	688.0
Participating securities										0.7	1.0	1.1
Basic weighted average common shares outstanding										602.5	635.5	686.9
Basic weighted average shares outstanding										603.2	636.5	688.0
Dilutive potential common shares	[1]									7.5	7.3	8.1
Dilutive weighted average shares outstanding										610.7	643.8	696.1
Participating securities										0.7	1.0	1.1
Diluted weighted average common shares outstanding										610.0	642.8	695.0
Income (Loss) from Continuing Operations, Per Basic Share										$ 13.60	$ 7.70	$ 7.52
Income (Loss) from Continuing Operations, Per Diluted Share										$ 13.43	$ 7.61	$ 7.44

[1] Diluted earnings per share includes any dilutive impact of stock options, restricted stock units, performance-based restricted stock units and performance awards.