BUSINESS SEGMENTS - Reconciliation of Contribution to Earnings to Net Earnings (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings									$ 1,109	$ 1,892	$ 850
Interest expense, net of capitalized interest(1)									(393)	(436)	(347)
Income before income taxes(1)									716	1,456	503
Income taxes(1)									(134)	(429)	3
Net earnings	$ 271	$ 130	$ 24	$ 157	$ 551	$ 227	$ 168	$ 81	582	1,027	506
Continuing operations
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings									1,109	935	694
Discontinued operations
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings									$ 0	$ 957	$ 156