STATEMENT OF CONSOLIDATED CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common stock, dividends, per share (in USD per share)	$ 1.00	$ 1.00	$ 1.00