Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income from Continuing Operations	$ 659	$ 585	$ 593
Pension and other postretirement activity, net of income taxes (benefit)	(20)	6	(12)
Comprehensive Income (Loss) from Continuing Operations	639	591	581
Less: Comprehensive Income from Continuing Operations Attributable to Noncontrolling Interests	6	6	6
Comprehensive Income from Continuing Operations Attributable to Ameren Corporation	633	585	575
Comprehensive Income (Loss) from Discontinued Operations Attributable to Ameren Common shareholders	0	51	(1)
Comprehensive Income (Loss)	$ 633	$ 636	$ 574