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Property And Plant, Net (Tables)
 12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Schedule Of Property And Plant, Net
The following table presents property and plant, net, for each of the Ameren Companies at December 31, 2012, and 2011:
 
Ameren(a)(b)
 
Ameren
Missouri(b)
 
Ameren
Illinois
2012
 
 
 
 
 
Property and plant, at original cost:
 
 
 
 
 
Electric
$
22,055

 
$
15,638

 
$
4,985

Natural gas
1,854

 
393

 
1,461

 
23,909

 
16,031

 
6,446

Less: Accumulated depreciation and amortization
8,823

 
6,614

 
1,495

 
15,086

 
9,417

 
4,951

Construction work in progress:
 
 
 
 
 
Nuclear fuel in process
317

 
317

 
—

Other
693

 
427

 
101

Property and plant, net
$
16,096

 
$
10,161

 
$
5,052

2011
 
 
 
 
 
Property and plant, at original cost:
 
 
 
 
 
Electric
$
24,717

 
$
15,099

 
$
4,684

Natural gas
1,751

 
385

 
1,368

 
26,468

 
15,484

 
6,052

Less: Accumulated depreciation and amortization
9,429

 
6,276

 
1,364

 
17,039

 
9,208

 
4,688

Construction work in progress:
 
 
 
 
 
Nuclear fuel in process
255

 
255

 
—

Other
833

 
495

 
82

Property and plant, net
$
18,127

 
$
9,958

 
$
4,770


(a)
Includes amounts for Ameren registrant and nonregistrant subsidiaries as well as intercompany eliminations.
(b)
Amounts in Ameren and Ameren Missouri include two electric generation CTs under two separate capital lease agreements. The gross asset value of those agreements was $228 million and $229 million at December 31, 2012, and 2011, respectively. The total accumulated depreciation associated with the two CTs was $52 million and $52 million at December 31, 2012, and 2011, respectively. In addition, Ameren Missouri has investments in debt securities, which are classified as held-to-maturity, related to the two CTs from the city of Bowling Green and Audrain County. As of December 31, 2012, and 2011, the carrying value of these debt securities was $304 million and $309 million, respectively.
Accrued Capital Expenditures
The following table provides accrued capital expenditures at December 31, 2012, 2011, and 2010, which represent noncash investing activity excluded from the statements of cash flows:
 
Ameren(a)
 
Ameren
Missouri
 
Ameren
Illinois
2012
$
108

 
$
63

 
$
37

2011
107

 
73

 
18

2010
79

 
53

 
15


(a)
Includes amounts for Ameren registrant and nonregistrant subsidiaries.