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Property And Plant, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule Of Property And Plant, Net
The following table presents property, plant, and equipment, net, at December 31, 2019 and 2018:
 
 
Ameren
Missouri(a)
 
Ameren
Illinois
 
Other
 
Ameren(a)
2019
 
 
 
 
 
 
 
 
Property, plant, and equipment at original cost:(b)
 
 
 
 
 
 
 
 
Electric generation
 
$
11,880

 
$
—

 
$
—

 
$
11,880

Electric distribution
 
6,371

 
6,299

 
—

 
12,670

Electric transmission
 
1,405

 
3,101

 
1,642

 
6,148

Natural gas
 
528

 
3,024

 
—

 
3,552

Other(c)
 
1,173

 
993

 
236

 
2,402

 
 
21,357

 
13,417

 
1,878

 
36,652

Less: Accumulated depreciation and amortization
 
9,195

 
3,536

 
275

 
13,006

 
 
12,162

 
9,881

 
1,603

 
23,646

Construction work in progress:
 
 
 
 
 
 
 
 
Nuclear fuel in process
 
135

 
—

 
—

 
135

Other
 
338

 
202

 
55

 
595

Property, plant, and equipment, net
 
$
12,635

 
$
10,083

 
$
1,658

 
$
24,376

2018
 
 
 
 
 
 
 
 
Property, plant, and equipment at original cost:(b)
 
 
 
 
 
 
 
 
Electric generation
 
$
11,432

 
$
—

 
$
—

 
$
11,432

Electric distribution
 
5,989

 
5,970

 
—

 
11,959

Electric transmission
 
1,277

 
2,647

 
1,385

 
5,309

Natural gas
 
500

 
2,701

 
—

 
3,201

Other(c)
 
1,008

 
863

 
230

 
2,101

 
 
20,206

 
12,181

 
1,615

 
34,002

Less: Accumulated depreciation and amortization
 
8,726

 
3,294

 
253

 
12,273

 
 
11,480

 
8,887

 
1,362

 
21,729

Construction work in progress:
 
 
 
 
 
 
 
 
Nuclear fuel in process
 
217

 
—

 
—

 
217

Other
 
406

 
311

 
147

 
864

Property, plant, and equipment, net
 
$
12,103

 
$
9,198

 
$
1,509

 
$
22,810


(a)
Amounts include two CTs that have related financing obligations. The gross cumulative asset value of those agreements was $236 million and $235 million at December 31, 2019 and 2018, respectively. The total accumulated depreciation associated with the two CTs was $95 million and $89 million at December 31, 2019 and 2018, respectively. See Note 5 – Long-term Debt and Equity Financings for additional information on these agreements.
(b)
The estimated lives for each asset group are as follows: 5 to 72 years for electric generation, excluding Ameren Missouri’s hydro generating assets which have useful lives of up to 150 years, 20 to 80 years for electric distribution, 50 to 75 years for electric transmission, 20 to 80 years for natural gas, and 5 to 55 years for other.
(c)
Other property, plant, and equipment includes assets used to support electric and natural gas services.
Schedule of Capitalized Software
Capitalized software costs are classified within “Property, Plant, and Equipment, Net” on the balance sheet and are amortized on a straight-line basis over the expected period of benefit, ranging from 5 to 10 years. The following table presents the amortization, gross carrying value, and related accumulated amortization of capitalized software by year:
 
 
Amortization Expense
 
Gross Carrying Value
 
Accumulated Amortization
 
 
2019
2018
2017
 
2019
2018
 
2019
2018
Ameren
 
$
78

$
71

$
58

 
$
901

$
734

 
$
(584
)
$
(514
)
Ameren Missouri
 
30

24

20

 
303

223

 
(153
)
(125
)
Ameren Illinois
 
45

44

36

 
377

297

 
(221
)
(183
)
Schedule of Capitalized Software, Future Amortization Expense
Annual amortization expense for capitalized costs for software placed in service as of December 31, 2019, is estimated to be as follows:
 
 
2020
 
2021
 
2022
 
2023
 
2024
Ameren
 
$
80

 
$
74

 
$
63

 
$
50

 
$
24

Ameren Missouri
 
36

 
34

 
29

 
24

 
12

Ameren Illinois
 
41

 
36

 
32

 
24

 
12