Statement of Consolidated Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	[2]	Dec. 31, 2014	[2]
Common stock, dividends, per share	$ 1.00	$ 1.00	[1]	$ 1.00	[1]
Retained Earnings (Accumulated Deficit) [Member]
Common stock, dividends, per share	1.00	1.00		1.00
Parent [Member]
Common stock, dividends, per share	$ 1.00	$ 1.00		$ 1.00

[1] Financial information for 2015 and 2014 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.

[2] Financial information for 2015, 2014, and 2013 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.