Long-Term Debt And Equity Financings (Schedule Of Long-Term Debt Outstanding) (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital Lease Obligations	$ 276,000,000	$ 282,000,000
Less: Maturities due within one year	(841,000,000)	(681,000,000)
Long-term Debt, Net	7,094,000,000	6,595,000,000
Held-to-maturity Securities	276,000,000	282,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	506,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,617,000,000
Parent Company
Debt Instrument [Line Items]
Long-term debt, gross	700,000,000	700,000,000
Debt Issuance Costs, Net	(4,000,000)	(6,000,000)
Long-term Debt, Net	696,000,000	694,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	350,000,000
Union Electric Company
Debt Instrument [Line Items]
Long-term debt, gross	3,988,000,000	4,019,000,000
Less: Unamortized discount and premium	(7,000,000)	(6,000,000)
Debt Issuance Costs, Net	(20,000,000)	(19,000,000)
Less: Maturities due within one year	(384,000,000)	(431,000,000)
Long-term Debt, Net	3,577,000,000	3,563,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	56,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 2,867,000,000
Union Electric Company \| 6.40% Senior secured notes due 2017
Debt Instrument [Line Items]
Long-term debt interest rate	6.40%
Union Electric Company \| City Of Bowling Green Capital Lease Peno Creek Ct
Debt Instrument [Line Items]
Capital Lease Obligations	$ 36,000,000	42,000,000
Long-term debt maturity date	2022
Union Electric Company \| Audrain County Capital Lease Audrain County Ct
Debt Instrument [Line Items]
Capital Lease Obligations	$ 240,000,000	240,000,000
Long-term debt maturity date	2023
Ameren Illinois Company
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,857,000,000	2,607,000,000
Less: Unamortized discount and premium	(3,000,000)	0
Debt Issuance Costs, Net	(24,000,000)	(19,000,000)
Less: Maturities due within one year	(457,000,000)	(250,000,000)
Long-term Debt, Net	2,373,000,000	2,338,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	400,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 2,000,000,000
Ameren Illinois Company \| Senior Secured Notes6125 Due2017
Debt Instrument [Line Items]
Long-term debt interest rate	6.125%
Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000,000	0
Debt Issuance Costs, Net	(2,000,000)	0
Long-term Debt, Net	$ 448,000,000	0
Redemption price, percentage	100.00%
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 50,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	400,000,000
Unsecured Debt \| Parent Company \| Senior Unsecured Notes270 due 2020
Debt Instrument [Line Items]
Debt instrument face amount	$ 350,000,000	350,000,000
Long-term debt interest rate	2.70%
Long-term debt maturity date	2020
Unsecured Debt \| Parent Company \| Senior Unsecured Notes365 due 2026
Debt Instrument [Line Items]
Debt instrument face amount	$ 350,000,000	350,000,000
Long-term debt interest rate	3.65%
Long-term debt maturity date	2026
Unsecured Debt \| Ameren Transmission Company of Illinois \| Senior Unsecured Notes, 3.43%, Due 2050
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000	0
Long-term debt interest rate	3.43%
Secured Debt \| Union Electric Company \| 6.40% Senior secured notes due 2017
Debt Instrument [Line Items]
Debt instrument face amount	$ 0	425,000,000
Long-term debt interest rate	6.40%
Long-term debt maturity date	2017
Secured Debt \| Union Electric Company \| 6.00% Senior secured notes due 2018
Debt Instrument [Line Items]
Debt instrument face amount	$ 179,000,000	179,000,000
Long-term debt interest rate	6.00%
Long-term debt maturity date	2018
Secured Debt \| Union Electric Company \| 5.10% Senior secured notes due 2018
Debt Instrument [Line Items]
Debt instrument face amount	$ 199,000,000	199,000,000
Long-term debt interest rate	5.10%
Long-term debt maturity date	2018
Secured Debt \| Union Electric Company \| 6.70% Senior secured notes due 2019
Debt Instrument [Line Items]
Debt instrument face amount	$ 329,000,000	329,000,000
Long-term debt interest rate	6.70%
Long-term debt maturity date	2019
Secured Debt \| Union Electric Company \| 5.10% Senior secured notes due 2019
Debt Instrument [Line Items]
Debt instrument face amount	$ 244,000,000	244,000,000
Long-term debt interest rate	5.10%
Long-term debt maturity date	2019
Secured Debt \| Union Electric Company \| 5.00% Senior secured notes due 2020
Debt Instrument [Line Items]
Debt instrument face amount	$ 85,000,000	85,000,000
Long-term debt interest rate	5.00%
Long-term debt maturity date	2020
Secured Debt \| Union Electric Company \| Senior Secured Notes350 Due2024
Debt Instrument [Line Items]
Debt instrument face amount	$ 350,000,000	350,000,000
Long-term debt interest rate	3.50%
Long-term debt maturity date	2024
Secured Debt \| Union Electric Company \| Senior Secured Notes, 2.95%, Due 2027
Debt Instrument [Line Items]
Debt instrument face amount	$ 400,000,000
Long-term debt interest rate	2.95%
Long-term debt maturity date	2027
Secured Debt \| Union Electric Company \| 5.50% Senior secured notes due 2034
Debt Instrument [Line Items]
Debt instrument face amount	$ 184,000,000	184,000,000
Long-term debt interest rate	5.50%
Long-term debt maturity date	2034
Secured Debt \| Union Electric Company \| 5.30% Senior secured notes due 2037
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000	300,000,000
Long-term debt interest rate	5.30%
Long-term debt maturity date	2037
Secured Debt \| Union Electric Company \| 8.45% Senior secured notes due 2039
Debt Instrument [Line Items]
Debt instrument face amount	$ 350,000,000	350,000,000
Long-term debt interest rate	8.45%
Long-term debt maturity date	2039
Secured Debt \| Union Electric Company \| 3.90% Senior secured notes due 2042
Debt Instrument [Line Items]
Debt instrument face amount	$ 485,000,000	485,000,000
Long-term debt interest rate	3.90%
Long-term debt maturity date	2042
Secured Debt \| Union Electric Company \| Senior Secured Notes, 3.65%, Due 2045
Debt Instrument [Line Items]
Debt instrument face amount	$ 400,000,000	400,000,000
Long-term debt interest rate	3.65%
Long-term debt maturity date	2045
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes6125 Due2017
Debt Instrument [Line Items]
Debt instrument face amount	$ 0	250,000,000
Long-term debt interest rate	6.125%
Long-term debt maturity date	2017
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 6.25% Due 2018
Debt Instrument [Line Items]
Debt instrument face amount	$ 144,000,000	144,000,000
Long-term debt interest rate	6.25%
Long-term debt maturity date	2018
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 9.75% Due 2018
Debt Instrument [Line Items]
Debt instrument face amount	$ 313,000,000	313,000,000
Long-term debt interest rate	9.75%
Long-term debt maturity date	2018
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes, 2.70%, Due 2022
Debt Instrument [Line Items]
Debt instrument face amount	$ 400,000,000	400,000,000
Long-term debt interest rate	2.70%
Long-term debt maturity date	2022
Secured Debt \| Ameren Illinois Company \| Series 1993 5.90% Due 2023
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,000,000
Long-term debt interest rate	5.90%
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes, 3.25%, Due 2025
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000	300,000,000
Long-term debt interest rate	3.25%
Long-term debt maturity date	2025
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 6.125% Due 2028
Debt Instrument [Line Items]
Debt instrument face amount	$ 60,000,000	60,000,000
Long-term debt interest rate	6.125%
Long-term debt maturity date	2028
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 6.70% Due 2036
Debt Instrument [Line Items]
Debt instrument face amount	$ 61,000,000	61,000,000
Long-term debt interest rate	6.70%
Long-term debt maturity date	2036
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 6.70% Due 2036
Debt Instrument [Line Items]
Debt instrument face amount	$ 42,000,000	42,000,000
Long-term debt interest rate	6.70%
Long-term debt maturity date	2036
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 4.80% Due 2043
Debt Instrument [Line Items]
Debt instrument face amount	$ 280,000,000	280,000,000
Long-term debt interest rate	4.80%
Long-term debt maturity date	2043
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes 4.30% Due 2044
Debt Instrument [Line Items]
Debt instrument face amount	$ 250,000,000	250,000,000
Long-term debt interest rate	4.30%
Long-term debt maturity date	2044
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes, 4.15%, Due 2046
Debt Instrument [Line Items]
Debt instrument face amount	$ 490,000,000	490,000,000
Long-term debt interest rate	4.15%
Long-term debt maturity date	2046
Secured Debt \| Ameren Illinois Company \| Senior Secured Notes, 3.70%, Due 2047
Debt Instrument [Line Items]
Debt instrument face amount	$ 500,000,000	0
Long-term debt interest rate	3.70%
Long-term debt maturity date	2047
Secured Debt \| Ameren Transmission Company of Illinois \| Senior Unsecured Notes, 3.43%, Due 2050
Debt Instrument [Line Items]
Long-term debt interest rate	3.43%
Long-term debt maturity date	2050
Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1992 Series due 2022
Debt Instrument [Line Items]
Debt instrument face amount	$ 47,000,000	47,000,000
Long-term debt maturity date	2022
Redemption price, percentage	100.00%
Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| Series1993 Due2028
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,000,000
Long-term debt interest rate	5.45%
Long-term debt maturity date	2028
Redemption price, percentage	100.00%
Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series A due 2033
Debt Instrument [Line Items]
Debt instrument face amount	$ 60,000,000	60,000,000
Long-term debt maturity date	2033
Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series B due 2033
Debt Instrument [Line Items]
Debt instrument face amount	$ 50,000,000	50,000,000
Long-term debt maturity date	2033
Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series C due 2033
Debt Instrument [Line Items]
Debt instrument face amount	$ 50,000,000	50,000,000
Long-term debt maturity date	2033
Environmental Improvement And Pollution Control Revenue Bonds \| Ameren Illinois Company \| Series 1993 5.90% Due 2023
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,000,000	1,000,000
Long-term debt interest rate	5.90%
Long-term debt maturity date	2023
Redemption price, percentage	100.00%
Environmental Improvement And Pollution Control Revenue Bonds \| Ameren Illinois Company \| Series 1994 A 5.70% Due 2024
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,000,000	1,000,000
Long-term debt interest rate	5.70%
Long-term debt maturity date	2024
Redemption price, percentage	100.00%
Environmental Improvement And Pollution Control Revenue Bonds \| Ameren Illinois Company \| Series B-1 1993 Due 2028
Debt Instrument [Line Items]
Debt instrument face amount	$ 17,000,000	17,000,000
Long-term debt maturity date	2028
Redemption price, percentage	100.00%
Capital Lease Obligations [Member] \| Union Electric Company
Debt Instrument [Line Items]
Held-to-maturity Securities	$ 276,000,000	$ 282,000,000
Maximum \| Unsecured Debt \| Ameren Transmission Company of Illinois \| Senior Unsecured Notes, 3.43%, Due 2050
Debt Instrument [Line Items]
Debt instrument face amount	$ 450,000,000
Maximum \| Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1992 Series due 2022
Debt Instrument [Line Items]
Long-term debt interest rate	18.00%
Maximum \| Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series A due 2033
Debt Instrument [Line Items]
Long-term debt interest rate	18.00%
Maximum \| Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series B due 2033
Debt Instrument [Line Items]
Long-term debt interest rate	18.00%
Maximum \| Environmental Improvement And Pollution Control Revenue Bonds \| Union Electric Company \| 1998 Series C due 2033
Debt Instrument [Line Items]
Long-term debt interest rate	18.00%
Debt Instrument, Redemption, Period One \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 49,500,000
Debt Instrument, Redemption, Period Two \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	49,500,000
Debt Instrument, Redemption, Period Three \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	49,500,000
Debt Instrument, Redemption, Period Four \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	49,500,000
Debt Instrument, Redemption, Period Five \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	49,500,000
Debt Instrument, Redemption, Period Six \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	49,500,000
Debt Instrument, Redemption, Period Seven \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	76,500,000
Debt Instrument, Redemption, Period Eight \| Unsecured Debt \| Ameren Transmission Company of Illinois
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 76,500,000

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant