Selected Quarterly Information (Tables)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Information [Abstract]

Summary Of Selected Quarterly Information

SELECTED QUARTERLY INFORMATION (Unaudited) (In millions, except per share amounts)

Ameren	2019								2018
Quarter ended	March 31		June 30		September 30		December 31		March 31		June 30		September 30		December 31
Operating revenues	$	1,556	$	1,379	$	1,659	$	1,316	$	1,585	$	1,563	$	1,724	$	1,419
Operating income	288		280		520		179		273		385		533		166
Net income	193		180		366		95		153		240		359		69
Net income attributable to Ameren common shareholders	$	191	$	179	$	364	$	94	$	151	$	239	$	357	$	68
Earnings per common share – basic	$	0.78	$	0.73	$	1.48	$	0.38	$	0.62	$	0.98	$	1.46	$	0.28
Earnings per common share – diluted	$	0.78	$	0.72	$	1.47	$	0.38	$	0.62	$	0.97	$	1.45	$	0.28

Ameren Missouri Quarter ended	Operating Revenues		Operating Income		Net Income (Loss)			Net Income (Loss) Available to Common Shareholder
March 31, 2019	$	758	$	79	$	40		$	39
March 31, 2018	792		90		39			38
June 30, 2019	798		152		108			107
June 30, 2018	955		258		169			168
September 30, 2019	1,059		381		301			300
September 30, 2018	1,129		394		295			294
December 31, 2019	628		5		(20		)	(20		)
December 31, 2018	713		7		(22		)	(22		)

Ameren Illinois Quarter ended	Operating Revenues		Operating Income		Net Income		Net Income Available to Common Shareholder
March 31, 2019	$	762	$	186	$	121	$	120
March 31, 2018	760		159		96		95
June 30, 2019	547		104		63		62
June 30, 2018	578		105		63		62
September 30, 2019	564		110		65		65
September 30, 2018	564		113		63		63
December 31, 2019	654		150		97		96
December 31, 2018	674		135		85		84