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		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net (loss)/earnings		$ (2,942)	$ 2,196	$ (793)	$ 4,673
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic					3
Net earnings available to common shareholders		$ (2,942)	$ 2,196	$ (793)	$ 4,670
Basic weighted average shares outstanding		565.3	582.6	566.6	586.6
Participating securities		0.6	0.7	0.6	0.6
Basic weighted average common shares outstanding		564.7	581.9	566.0	586.0
Basic weighted average shares outstanding		565.3	582.6	566.6	586.6
Dilutive potential common shares	[1]		6.1		6.3
Diluted weighted average shares outstanding		565.3	588.7	566.6	592.9
Participating securities		0.6	0.7	0.6	0.6
Diluted weighted average common shares outstanding		564.7	588.0	566.0	592.3
Income (Loss) from Continuing Operations, Per Basic Share		$ (5.21)		$ (1.40)	$ 7.97
Earnings Per Share, Basic		(5.21)	$ 3.77	(1.40)	7.97
Income (Loss) from Continuing Operations, Per Diluted Share		$ (5.21)	$ 3.73	$ (1.40)	$ 7.88

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