SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) - Key Quarterly Financial Data for the Last Two Years (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 1,636	$ 1,910	$ 2,065	$ 1,865	$ 1,823	$ 1,872	$ 1,808	$ 1,693	$ 7,476	$ 7,196	$ 6,365
Operating income from continuing operations	177	337	476	404	476	205	157	293	1,394	1,131	822
Earnings (loss) from continuing operations before income taxes	(114)	240	382	299	374	103	58	181	807	716	504
Net earnings	$ (93)	$ 255	$ 317	$ 269	$ 271	$ 130	$ 24	$ 157	$ 748	$ 582	$ 1,027
Basic and diluted net earnings (loss) per share	$ (0.12)	$ 0.34	$ 0.42	$ 0.35	$ 0.36	$ 0.17	$ 0.03	$ 0.21	$ 0.99	$ 0.77	$ 1.40
Dividends paid per share	$ 0.34	$ 0.34	$ 0.32	$ 0.32	$ 0.32	$ 0.31	$ 0.31	$ 0.31	$ 1.32	$ 1.25	$ 1.24
Continuing operations
Revenues											$ 6,365