Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions		Total	Common Stock	Common Stock Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2015		$ 10,440	$ 482	$ 2,730	$ 22,903	$ (12,392)	$ (3,283)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		2,572			2,572
Cash dividends declared		(932)			(932)
Equity-based awards		356		89		267
Shares purchased		(2,031)				(2,031)
Other comprehensive income (loss)		(104)					(104)
Ending Balance at Dec. 31, 2016		10,301	482	2,819	24,543	(14,156)	(3,387)
Cumulative-effects adjustments	[1]	(3)			(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		2,912			2,912
Cash dividends declared		(1,008)			(1,008)
Equity-based awards		199		53		146
Shares purchased		(1,533)				(1,533)
Other comprehensive income (loss)		567					567
Ending Balance at Dec. 31, 2017		11,435	482	2,872	26,444	(15,543)	(2,820)
Cumulative-effects adjustments		0			638		(638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		3,345			3,345
Cash dividends declared		(1,101)			(1,101)
Equity-based awards		179		74		105
Shares purchased		(1,806)				(1,806)
Other comprehensive income (loss)		(320)					(320)
Ending Balance at Dec. 31, 2018		$ 11,732	$ 482	$ 2,946	$ 29,326	$ (17,244)	$ (3,778)

[1] Reflects the cumulative effect of Accounting Standards Update (ASU) 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, which we adopted on January 1, 2017.