|
Investments In Debt And Equity Securities (Available-For-Sale Investments) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
Dec. 31, 2012
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
$ 1,461 |
|
|
$ 1,216 |
|
| Gross Unrealized Holding Losses |
33 |
|
|
30 |
|
| Estimated Fair Value |
5,277 |
|
|
4,932 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |
|
|
|
|
|
| Realized gains |
31 |
|
21 |
|
|
| Realized losses |
7 |
|
2 |
|
|
|
Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1,439 |
|
|
1,199 |
|
| Gross Unrealized Holding Losses |
26 |
|
|
23 |
|
| Estimated Fair Value |
4,546 |
|
|
4,263 |
|
|
Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
22 |
[1] |
|
17 |
[1] |
| Gross Unrealized Holding Losses |
7 |
[1] |
|
7 |
[1] |
| Estimated Fair Value |
731 |
[1] |
|
669 |
[1] |
|
Cash and Cash Equivalents [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
91 |
|
|
105 |
|
|
Cash and Cash Equivalents [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
21 |
|
|
17 |
|
|
Equity Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1,380 |
|
|
1,132 |
|
| Gross Unrealized Holding Losses |
19 |
|
|
19 |
|
| Estimated Fair Value |
3,104 |
|
|
2,837 |
|
|
Equity Securities [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
16 |
|
|
10 |
|
| Gross Unrealized Holding Losses |
|
|
|
0 |
|
| Estimated Fair Value |
84 |
|
|
63 |
|
|
Corporate Debt Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
17 |
|
|
21 |
|
| Gross Unrealized Holding Losses |
2 |
|
|
1 |
|
| Estimated Fair Value |
333 |
|
|
338 |
|
|
Corporate Debt Securities [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
2 |
|
| Gross Unrealized Holding Losses |
|
|
|
0 |
|
| Estimated Fair Value |
347 |
|
|
381 |
|
|
Municipal Bonds [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
10 |
|
|
12 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
1 |
|
| Estimated Fair Value |
189 |
|
|
194 |
|
|
Municipal Bonds [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
|
4 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
1 |
|
| Estimated Fair Value |
75 |
|
|
70 |
|
|
US Treasury and Government [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
20 |
|
|
24 |
|
| Gross Unrealized Holding Losses |
2 |
|
|
1 |
|
| Estimated Fair Value |
666 |
|
|
625 |
|
|
US Treasury and Government [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
0 |
|
| Estimated Fair Value |
73 |
|
|
23 |
|
|
Auction Rate Securities [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Losses |
6 |
|
|
6 |
|
| Estimated Fair Value |
28 |
|
|
29 |
|
|
Other Debt Obligations [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
12 |
|
|
10 |
|
| Gross Unrealized Holding Losses |
2 |
|
|
1 |
|
| Estimated Fair Value |
163 |
|
|
164 |
|
|
Other Debt Obligations [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
1 |
|
| Estimated Fair Value |
103 |
|
|
86 |
|
|
Duke Energy Carolinas [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
764 |
|
|
632 |
|
| Gross Unrealized Holding Losses |
10 |
|
|
9 |
|
| Estimated Fair Value |
2,520 |
|
|
2,364 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |
|
|
|
|
|
| Realized gains |
25 |
|
20 |
|
|
| Realized losses |
4 |
|
2 |
|
|
|
Duke Energy Carolinas [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
764 |
|
|
632 |
|
| Gross Unrealized Holding Losses |
9 |
|
|
8 |
|
| Estimated Fair Value |
2,517 |
|
|
2,361 |
|
|
Duke Energy Carolinas [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Losses |
1 |
[2] |
|
1 |
[2] |
| Estimated Fair Value |
3 |
[2] |
|
3 |
[2] |
|
Duke Energy Carolinas [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
41 |
|
|
40 |
|
|
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
736 |
|
|
600 |
|
| Gross Unrealized Holding Losses |
4 |
|
|
5 |
|
| Estimated Fair Value |
1,735 |
|
|
1,592 |
|
|
Duke Energy Carolinas [Member] | Corporate Debt Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
9 |
|
|
11 |
|
| Gross Unrealized Holding Losses |
2 |
|
|
1 |
|
| Estimated Fair Value |
239 |
|
|
250 |
|
|
Duke Energy Carolinas [Member] | Municipal Bonds [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
0 |
|
|
2 |
|
| Estimated Fair Value |
21 |
|
|
40 |
|
|
Duke Energy Carolinas [Member] | US Treasury and Government [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
8 |
|
|
10 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
|
|
| Estimated Fair Value |
345 |
|
|
304 |
|
|
Duke Energy Carolinas [Member] | Auction Rate Securities [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Losses |
1 |
|
|
1 |
|
| Estimated Fair Value |
3 |
|
|
3 |
|
|
Duke Energy Carolinas [Member] | Other Debt Obligations [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
11 |
|
|
9 |
|
| Gross Unrealized Holding Losses |
2 |
|
|
2 |
|
| Estimated Fair Value |
136 |
|
|
135 |
|
|
Progress Energy [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
678 |
|
|
570 |
|
| Gross Unrealized Holding Losses |
17 |
|
|
15 |
|
| Estimated Fair Value |
2,090 |
|
|
1,959 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |
|
|
|
|
|
| Realized gains |
5 |
|
7 |
|
|
| Realized losses |
2 |
|
3 |
|
|
|
Progress Energy [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
675 |
|
|
567 |
|
| Gross Unrealized Holding Losses |
17 |
|
|
15 |
|
| Estimated Fair Value |
2,029 |
|
|
1,902 |
|
|
Progress Energy [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
[1] |
|
3 |
[1] |
| Estimated Fair Value |
61 |
[1] |
|
57 |
[1] |
|
Progress Energy [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
50 |
|
|
65 |
|
|
Progress Energy [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
21 |
|
|
17 |
|
|
Progress Energy [Member] | Equity Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
644 |
|
|
532 |
|
| Gross Unrealized Holding Losses |
15 |
|
|
14 |
|
| Estimated Fair Value |
1,369 |
|
|
1,245 |
|
|
Progress Energy [Member] | Corporate Debt Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
8 |
|
|
9 |
|
| Estimated Fair Value |
94 |
|
|
89 |
|
|
Progress Energy [Member] | Municipal Bonds [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
10 |
|
|
11 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
1 |
|
| Estimated Fair Value |
168 |
|
|
154 |
|
|
Progress Energy [Member] | Municipal Bonds [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
|
|
3 |
|
| Estimated Fair Value |
40 |
|
|
40 |
|
|
Progress Energy [Member] | US Treasury and Government [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
12 |
|
|
14 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
|
|
| Estimated Fair Value |
321 |
|
|
321 |
|
|
Progress Energy [Member] | Other Debt Obligations [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
1 |
|
| Estimated Fair Value |
27 |
|
|
28 |
|
|
Duke Energy Progress [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
435 |
|
|
363 |
|
| Gross Unrealized Holding Losses |
12 |
|
|
11 |
|
| Estimated Fair Value |
1,360 |
|
|
1,278 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |
|
|
|
|
|
| Realized gains |
2 |
|
5 |
|
|
| Realized losses |
1 |
|
2 |
|
|
|
Duke Energy Progress [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
435 |
|
|
363 |
|
| Gross Unrealized Holding Losses |
12 |
|
|
11 |
|
| Estimated Fair Value |
1,356 |
|
|
1,275 |
|
|
Duke Energy Progress [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
4 |
[1] |
|
3 |
[1] |
|
Duke Energy Progress [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
39 |
|
|
55 |
|
|
Duke Energy Progress [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
4 |
|
|
3 |
|
|
Duke Energy Progress [Member] | Equity Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
413 |
|
|
337 |
|
| Gross Unrealized Holding Losses |
11 |
|
|
11 |
|
| Estimated Fair Value |
894 |
|
|
811 |
|
|
Duke Energy Progress [Member] | Corporate Debt Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
6 |
|
|
8 |
|
| Estimated Fair Value |
84 |
|
|
78 |
|
|
Duke Energy Progress [Member] | Municipal Bonds [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
|
4 |
|
| Estimated Fair Value |
95 |
|
|
80 |
|
|
Duke Energy Progress [Member] | US Treasury and Government [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
11 |
|
|
13 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
|
|
| Estimated Fair Value |
233 |
|
|
241 |
|
|
Duke Energy Progress [Member] | Other Debt Obligations [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
1 |
|
| Estimated Fair Value |
11 |
|
|
10 |
|
|
Duke Energy Florida [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
243 |
|
|
207 |
|
| Gross Unrealized Holding Losses |
5 |
|
|
4 |
|
| Estimated Fair Value |
716 |
|
|
668 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |
|
|
|
|
|
| Realized gains |
3 |
|
2 |
|
|
| Realized losses |
1 |
|
1 |
|
|
|
Duke Energy Florida [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
240 |
|
|
204 |
|
| Gross Unrealized Holding Losses |
5 |
|
|
4 |
|
| Estimated Fair Value |
673 |
|
|
627 |
|
|
Duke Energy Florida [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
[3] |
|
3 |
[3] |
| Estimated Fair Value |
43 |
[3] |
|
41 |
[3] |
|
Duke Energy Florida [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
11 |
|
|
10 |
|
|
Duke Energy Florida [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Estimated Fair Value |
3 |
|
|
1 |
|
|
Duke Energy Florida [Member] | Equity Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
231 |
|
|
194 |
|
| Gross Unrealized Holding Losses |
4 |
|
|
4 |
|
| Estimated Fair Value |
475 |
|
|
434 |
|
|
Duke Energy Florida [Member] | Corporate Debt Securities [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
2 |
|
|
1 |
|
| Estimated Fair Value |
10 |
|
|
11 |
|
|
Duke Energy Florida [Member] | Municipal Bonds [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
6 |
|
|
7 |
|
| Gross Unrealized Holding Losses |
1 |
|
|
0 |
|
| Estimated Fair Value |
73 |
|
|
74 |
|
|
Duke Energy Florida [Member] | Municipal Bonds [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
|
|
3 |
|
| Estimated Fair Value |
40 |
|
|
40 |
|
|
Duke Energy Florida [Member] | US Treasury and Government [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
1 |
|
| Estimated Fair Value |
88 |
|
|
80 |
|
|
Duke Energy Florida [Member] | Other Debt Obligations [Member] | Ndtf [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
0 |
|
|
1 |
|
| Estimated Fair Value |
16 |
|
|
18 |
|
|
Duke Energy Indiana [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
15 |
|
|
10 |
|
| Gross Unrealized Holding Losses |
|
|
|
0 |
|
| Estimated Fair Value |
83 |
|
|
78 |
|
|
Duke Energy Indiana [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
15 |
[1] |
|
10 |
[1] |
| Gross Unrealized Holding Losses |
|
|
|
0 |
[1] |
| Estimated Fair Value |
83 |
[1] |
|
78 |
[1] |
|
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
14 |
|
|
9 |
|
| Gross Unrealized Holding Losses |
|
|
|
0 |
|
| Estimated Fair Value |
54 |
|
|
50 |
|
|
Duke Energy Indiana [Member] | Municipal Bonds [Member] | Other Classification [Member]
|
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
1 |
|
| Estimated Fair Value |
$ 29 |
|
|
$ 28 |
|
|
|
|