Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings including noncontrolling interests	$ 1,602	$ 1,288	$ 1,846
Other Comprehensive Income (Loss), Before tax
Foreign currency translation adjustment, before tax	692	(467)	(962)
Pension and other postretirement benefit liabilities adjustment, before tax	298	(1)	154
Deferred gain (loss) on hedging avtivities, before tax	12	33	(99)
Unrealized gain (loss) on investments, before tax	(1)	3	20
Other Comprehensive Income (Loss), Tax
Foreign currency translation adjustment, tax effect	59	(10)	(11)
Pension and other postretirement benefit liabilities adjustment, tax effect	(98)	3	(47)
Deferred gain (loss) on hedging activities, tax effect	(1)	(12)	37
Unrealized gain (loss) on investments, tax effect	2	(2)	2
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustment, net of tax	751	(477)	(973)
Pension and other postretirement benefit liabilities adjustment, net of tax	200	2	107
Deferred gain (loss) on hedging activities, net of tax	11	21	(62)
Unrealized gain (loss) on investments, net of tax	1	1	22
Other comprehensive income (loss)	963	(453)	(906)
Comprehensive income (loss)	2,565	835	940
Less: Comprehensive income (loss) attributable to noncontrolling interests	9	8	(4)
Comprehensive income (loss) attributable to controlling interests	$ 2,556	$ 827	$ 944