Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings including noncontrolling interests	$ 536	$ 195	$ 1,498	$ 810
Other Comprehensive Income (Loss), before Tax
Foreign currency translation adjustment, before tax	(178)	245	(369)	628
Pension and other postretirement benefit liabilities adjustment, before tax	8	174	23	193
Deferred gain (loss) on hedging activities, before tax	77	(26)	(12)	12
Unrealized gain (loss) on investments, before tax	(7)	6	(11)	1
Other Comprehensive Income (Loss), Tax
Foreign currency translation adjustment, tax effect	(1)	(40)	(23)	(4)
Pension and other postretirement benefit liabilities adjustment, tax effect	(3)	(66)	(7)	(74)
Deferred gain (loss) on hedging activities, tax effect	(17)	6	4	1
Unrealized gain (loss) on investments, tax effect	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustment, net of tax	(179)	205	(392)	624
Pension and other postretirement benefit liabilities adjustment, net of tax	5	108	16	119
Deferred gain (loss) on hedging activities, net of tax	60	(20)	(8)	13
Unrealized gain (loss) on investments, net of tax	(7)	6	(11)	1
Other comprehensive income (loss)	(121)	299	(395)	757
Comprehensive income (loss) including noncontrolling interests	415	494	1,103	1,567
Less: Comprehensive income (loss) attributable to noncontrolling interests	0	4	3	5
Comprehensive income (loss) attributable to controlling interests	$ 415	$ 490	$ 1,100	$ 1,562