Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule Of Lease Obligations

We lease various facilities, office equipment, plant equipment, and rail cars under capital and operating leases. The following table presents our lease obligations at December 31, 2018:

	2019		2020		2021		2022		2023		After 5 Years		Total
Ameren:
Minimum capital lease payments(a)(b)	$	32	$	32	$	33	$	32	$	264	$	—	$	393
Less amount representing interest	25		25		25		24		24		—		123
Present value of minimum capital lease payments	$	7	$	7	$	8	$	8	$	240	$	—	$	270
Operating leases	10		8		7		6		5		9		45
Total lease obligations	$	17	$	15	$	15	$	14	$	245	$	9	$	315
Ameren Missouri:
Minimum capital lease payments(b)(c)	$	32	$	32	$	33	$	32	$	264	$	—	$	393
Less amount representing interest	25		25		25		24		24		—		123
Present value of minimum capital lease payments	$	7	$	7	$	8	$	8	$	240	$	—	$	270
Operating leases	8		7		6		5		5		9		40
Total lease obligations	$	15	$	14	$	14	$	13	$	245	$	9	$	310
Ameren Illinois:
Operating leases	$	1	$	—	$	—	$	—	$	—	$	—	$	1

(a) See Note 3 – Property, Plant, and Equipment, Net for additional information.

(b) See Note 5 – Long-term Debt and Equity Financings for additional information on Ameren’s and Ameren Missouri’s capital lease agreements.

Schedule Of Rental Expense

The following table presents total operating lease expenses included in “Operating Expenses” in the statement of income for the years ended December 31, 2018, 2017, and 2016:

	2018		2017		2016
Ameren	$	9	$	11	$	38
Ameren Missouri	8		10		34
Ameren Illinois	1		1		30

Schedule Of Estimated Purchased Commitments

The table below presents our estimated minimum fuel, purchased power, and other commitments at December 31, 2018. Ameren’s and Ameren Illinois’ purchased power commitments include the Ameren Illinois agreements entered into as part of the IPA-administered power procurement process. Included in the Other column are minimum purchase commitments under contracts for equipment, design and construction, and meter reading services, among other agreements, at December 31, 2018.

	Coal		Natural Gas(a)		Nuclear Fuel		Purchased Power(b)(c)		Methane Gas		Other		Total
Ameren:
2019	$	349	$	197	$	25	$	157	$	4	$	67	$	799
2020	160		143		43		54		4		41		445
2021	121		77		59		10		4		30		301
2022	72		27		14		—		3		26		142
2023	—		7		42		—		3		27		79
Thereafter	—		34		31		—		29		72		166
Total	$	702	$	485	$	214	$	221	$	47	$	263	$	1,932
Ameren Missouri:
2019	$	349	$	40	$	25	$	—	$	4	$	49	$	467
2020	160		31		43		—		4		26		264
2021	121		15		59		—		4		26		225
2022	72		5		14		—		3		26		120
2023	—		3		42		—		3		27		75
Thereafter	—		14		31		—		29		56		130
Total	$	702	$	108	$	214	$	—	$	47	$	210	$	1,281
Ameren Illinois:
2019	$	—	$	157	$	—	$	157	$	—	$	8	$	322
2020	—		112		—		54		—		5		171
2021	—		62		—		10		—		—		72
2022	—		22		—		—		—		—		22
2023	—		4		—		—		—		—		4
Thereafter	—		20		—		—		—		—		20
Total	$	—	$	377	$	—	$	221	$	—	$	13	$	611

(a) Includes amounts for generation and for distribution.

(b) The purchased power amounts for Ameren and Ameren Illinois exclude agreements for renewable energy credits through 2034 with various renewable energy suppliers due to the contingent nature of the payment amounts.

(c) The purchased power amounts for Ameren and Ameren Missouri exclude a 102-megawatt power purchase agreement with a wind farm operator, which expires in 2024, due to the contingent nature of the payment amounts.