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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net (loss)/earnings	$ (1,010)	$ 1,167	$ (2,942)	$ 2,149	$ 3,424	$ 2,363	$ 2,196	$ 2,477	$ (636)	$ 10,460	$ 8,458
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic										7	6
Net earnings available to common shareholders									$ (636)	$ 10,453	$ 8,452
Basic weighted average shares outstanding									566.0	579.9	603.2
Participating securities									0.6	0.7	0.7
Basic weighted average common shares outstanding									565.4	579.2	602.5
Basic weighted average shares outstanding									566.0	579.9	603.2
Dilutive potential common shares										6.3	7.5	[1]
Dilutive weighted average shares outstanding									566.0	586.2	610.7
Participating securities									0.6	0.7	0.7
Diluted weighted average common shares outstanding									565.4	585.5	610.0
Earnings Per Share, Basic	$ (1.79)	$ 2.07	$ (5.21)	$ 3.79	$ 6.00	$ 4.11	$ 3.77	$ 4.19	$ (1.12)	$ 18.05	$ 14.03
Income (Loss) from Continuing Operations, Per Basic Share											14.03
Income (Loss) from Continuing Operations, Per Diluted Share											$ 13.85

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