Condensed Consolidating Financial Statements (Condensed Consolidating Statement of Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Consolidating Financial Information [Line Items]
Revenue	$ 39,350	$ 36,193	$ 30,973
Cost of sales	(32,291)	(29,478)	(24,731)
G&A	(2,411)	(2,258)	(2,006)
Operating earnings	4,648	4,457	4,236
Interest, net	(460)	(356)	(103)
Other, net	14	(16)	(56)
Earnings from continuing operations before income tax	4,202	4,085	4,077
Provision for income tax, net	(718)	(727)	(1,165)
Discontinued operations, net of tax	0	(13)	0
Equity in net earnings of subsidiaries	0	0	0
Net earnings	3,484	3,345	2,912
Comprehensive income	3,043	3,025	3,479
Consolidating Adjustments
Condensed Consolidating Financial Information [Line Items]
Revenue	0	0	0
Cost of sales	0	0	0
G&A	0	0	0
Operating earnings	0	0	0
Interest, net	0	0	0
Other, net	0	0	0
Earnings from continuing operations before income tax	0	0	0
Provision for income tax, net	0	0	0
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	(3,829)	(3,672)	(2,899)
Net earnings	(3,829)	(3,672)	(2,899)
Comprehensive income	(4,040)	(3,297)	(3,494)
Parent
Condensed Consolidating Financial Information [Line Items]
Revenue	0	0	0
Cost of sales	99	67	76
G&A	(75)	(90)	(48)
Operating earnings	24	(23)	28
Interest, net	(426)	(326)	(97)
Other, net	(60)	(81)	(72)
Earnings from continuing operations before income tax	(462)	(430)	(141)
Provision for income tax, net	117	116	154
Discontinued operations, net of tax		(13)
Equity in net earnings of subsidiaries	3,829	3,672	2,899
Net earnings	3,484	3,345	2,912
Comprehensive income	3,043	3,025	3,479
Guarantors on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenue	30,566	28,132	26,933
Cost of sales	(25,120)	(22,841)	(21,695)
G&A	(1,725)	(1,638)	(1,643)
Operating earnings	3,721	3,653	3,595
Interest, net	1	0	1
Other, net	15	12	12
Earnings from continuing operations before income tax	3,737	3,665	3,608
Provision for income tax, net	(626)	(677)	(1,262)
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	0	0	0
Net earnings	3,111	2,988	2,346
Comprehensive income	3,083	2,992	2,336
Other Subsidiaries on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenue	8,784	8,061	4,040
Cost of sales	(7,270)	(6,704)	(3,112)
G&A	(611)	(530)	(315)
Operating earnings	903	827	613
Interest, net	(35)	(30)	(7)
Other, net	59	53	4
Earnings from continuing operations before income tax	927	850	610
Provision for income tax, net	(209)	(166)	(57)
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	0	0	0
Net earnings	718	684	553
Comprehensive income	$ 957	$ 305	$ 1,158