CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Equity (Note H)
Common stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares, authorized (in shares)	1,200,000,000	600,000,000
Common stock, shares, issued (in shares)	423,166,234	245,811,180
Common stock, shares, outstanding (in shares)	388,703,543	210,681,661
Treasury stock, shares (in shares)	34,462,691	35,129,519
Preferred stock, shares, par value (in dollars per share)	$ 0.01	$ 0
Preferred stock, shares, issued (in shares)	20,000	0