|
Investments in Debt and Equity Securities (Available-For-Sale Investments) (Details) (USD $)
In Millions, unless otherwise specified
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
$ 2,011 |
|
$ 1,884 |
|
| Gross Unrealized Holding Losses |
42 |
|
47 |
|
| Estimated Fair Value |
5,747 |
|
5,551 |
|
|
Ndtf [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1,973 |
|
1,852 |
|
| Gross Unrealized Holding Losses |
37 |
|
36 |
|
| Estimated Fair Value |
5,374 |
|
5,133 |
|
|
Ndtf [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
74 |
|
110 |
|
|
Ndtf [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1,943 |
|
1,813 |
|
| Gross Unrealized Holding Losses |
28 |
|
10 |
|
| Estimated Fair Value |
3,825 |
|
3,579 |
|
|
Ndtf [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
13 |
|
8 |
|
| Gross Unrealized Holding Losses |
3 |
|
6 |
|
| Estimated Fair Value |
493 |
|
400 |
|
|
Ndtf [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
5 |
|
2 |
|
| Gross Unrealized Holding Losses |
1 |
|
6 |
|
| Estimated Fair Value |
132 |
|
160 |
|
|
Ndtf [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
12 |
|
7 |
|
| Gross Unrealized Holding Losses |
4 |
|
12 |
|
| Estimated Fair Value |
713 |
|
730 |
|
|
Ndtf [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
22 |
|
| Gross Unrealized Holding Losses |
1 |
|
2 |
|
| Estimated Fair Value |
137 |
|
154 |
|
|
Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
38 |
[1] |
32 |
[1] |
| Gross Unrealized Holding Losses |
5 |
[1] |
11 |
[1] |
| Estimated Fair Value |
373 |
[1] |
418 |
[1] |
|
Other Classification [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
16 |
|
21 |
|
|
Other Classification [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
32 |
|
29 |
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
95 |
|
91 |
|
|
Other Classification [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
2 |
|
1 |
|
| Gross Unrealized Holding Losses |
|
|
1 |
|
| Estimated Fair Value |
68 |
|
99 |
|
|
Other Classification [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
|
2 |
|
| Gross Unrealized Holding Losses |
|
|
2 |
|
| Estimated Fair Value |
82 |
|
79 |
|
|
Other Classification [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
16 |
|
17 |
|
|
Other Classification [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
|
| Gross Unrealized Holding Losses |
5 |
|
8 |
|
| Estimated Fair Value |
96 |
|
111 |
|
|
Duke Energy Carolinas [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1,058 |
|
1,004 |
|
| Gross Unrealized Holding Losses |
24 |
|
23 |
|
| Estimated Fair Value |
2,972 |
|
2,837 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1,058 |
|
1,004 |
|
| Gross Unrealized Holding Losses |
23 |
|
22 |
|
| Estimated Fair Value |
2,969 |
|
2,834 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
39 |
|
42 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1,046 |
|
974 |
|
| Gross Unrealized Holding Losses |
17 |
|
6 |
|
| Estimated Fair Value |
2,124 |
|
1,964 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
7 |
|
5 |
|
| Gross Unrealized Holding Losses |
3 |
|
5 |
|
| Estimated Fair Value |
345 |
|
274 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
1 |
|
|
|
| Gross Unrealized Holding Losses |
|
|
2 |
|
| Estimated Fair Value |
22 |
|
54 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
3 |
|
| Gross Unrealized Holding Losses |
2 |
|
7 |
|
| Estimated Fair Value |
317 |
|
354 |
|
|
Duke Energy Carolinas [Member] | Ndtf [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
22 |
|
| Gross Unrealized Holding Losses |
1 |
|
2 |
|
| Estimated Fair Value |
122 |
|
146 |
|
|
Duke Energy Carolinas [Member] | Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
[1] |
| Gross Unrealized Holding Losses |
1 |
[1] |
1 |
[1] |
| Estimated Fair Value |
3 |
[1] |
3 |
[1] |
|
Duke Energy Carolinas [Member] | Other Classification [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
1 |
|
1 |
|
| Estimated Fair Value |
3 |
|
3 |
|
|
Progress Energy [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
918 |
|
849 |
|
| Gross Unrealized Holding Losses |
14 |
|
14 |
|
| Estimated Fair Value |
2,463 |
|
2,358 |
|
|
Progress Energy [Member] | Ndtf [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
915 |
|
848 |
|
| Gross Unrealized Holding Losses |
14 |
|
14 |
|
| Estimated Fair Value |
2,405 |
|
2,299 |
|
|
Progress Energy [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
35 |
|
68 |
|
|
Progress Energy [Member] | Ndtf [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
897 |
|
839 |
|
| Gross Unrealized Holding Losses |
11 |
|
4 |
|
| Estimated Fair Value |
1,701 |
|
1,615 |
|
|
Progress Energy [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
6 |
|
3 |
|
| Gross Unrealized Holding Losses |
|
|
1 |
|
| Estimated Fair Value |
148 |
|
126 |
|
|
Progress Energy [Member] | Ndtf [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
2 |
|
| Gross Unrealized Holding Losses |
1 |
|
4 |
|
| Estimated Fair Value |
110 |
|
106 |
|
|
Progress Energy [Member] | Ndtf [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
8 |
|
4 |
|
| Gross Unrealized Holding Losses |
2 |
|
5 |
|
| Estimated Fair Value |
396 |
|
376 |
|
|
Progress Energy [Member] | Ndtf [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
15 |
|
8 |
|
|
Progress Energy [Member] | Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
[1] |
1 |
[1] |
| Gross Unrealized Holding Losses |
|
[1] |
|
[1] |
| Estimated Fair Value |
58 |
[1] |
59 |
[1] |
|
Progress Energy [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
15 |
|
20 |
|
|
Progress Energy [Member] | Other Classification [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
|
1 |
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
43 |
|
39 |
|
|
Duke Energy Progress [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
588 |
|
544 |
|
| Gross Unrealized Holding Losses |
10 |
|
11 |
|
| Estimated Fair Value |
1,625 |
|
1,540 |
|
|
Duke Energy Progress [Member] | Ndtf [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
588 |
|
544 |
|
| Gross Unrealized Holding Losses |
10 |
|
11 |
|
| Estimated Fair Value |
1,623 |
|
1,538 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
28 |
|
48 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
574 |
|
535 |
|
| Gross Unrealized Holding Losses |
7 |
|
3 |
|
| Estimated Fair Value |
1,127 |
|
1,069 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
3 |
|
| Gross Unrealized Holding Losses |
|
|
1 |
|
| Estimated Fair Value |
95 |
|
80 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
4 |
|
2 |
|
| Gross Unrealized Holding Losses |
1 |
|
4 |
|
| Estimated Fair Value |
108 |
|
104 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
6 |
|
4 |
|
| Gross Unrealized Holding Losses |
2 |
|
3 |
|
| Estimated Fair Value |
257 |
|
232 |
|
|
Duke Energy Progress [Member] | Ndtf [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
8 |
|
5 |
|
|
Duke Energy Progress [Member] | Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
[1] |
|
[1] |
| Gross Unrealized Holding Losses |
|
[1] |
|
[1] |
| Estimated Fair Value |
2 |
[1] |
2 |
[1] |
|
Duke Energy Progress [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
2 |
|
2 |
|
|
Duke Energy Florida [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
330 |
|
305 |
|
| Gross Unrealized Holding Losses |
4 |
|
3 |
|
| Estimated Fair Value |
825 |
|
803 |
|
|
Duke Energy Florida [Member] | Ndtf [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
327 |
|
304 |
|
| Gross Unrealized Holding Losses |
4 |
|
3 |
|
| Estimated Fair Value |
782 |
|
761 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
7 |
|
20 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
323 |
|
304 |
|
| Gross Unrealized Holding Losses |
4 |
|
1 |
|
| Estimated Fair Value |
574 |
|
546 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
2 |
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
53 |
|
46 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
2 |
|
2 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | US Treasury and Government [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
2 |
|
|
|
| Gross Unrealized Holding Losses |
|
|
2 |
|
| Estimated Fair Value |
139 |
|
144 |
|
|
Duke Energy Florida [Member] | Ndtf [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
7 |
|
3 |
|
|
Duke Energy Florida [Member] | Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
[1] |
1 |
[1] |
| Gross Unrealized Holding Losses |
|
[1] |
|
[1] |
| Estimated Fair Value |
43 |
[1] |
42 |
[1] |
|
Duke Energy Florida [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
|
|
3 |
|
|
Duke Energy Florida [Member] | Other Classification [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
3 |
|
1 |
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
43 |
|
39 |
|
|
Duke Energy Indiana [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
26 |
|
24 |
|
| Gross Unrealized Holding Losses |
|
|
1 |
|
| Estimated Fair Value |
99 |
|
94 |
|
|
Duke Energy Indiana [Member] | Other Classification [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
26 |
[1] |
24 |
[1] |
| Gross Unrealized Holding Losses |
|
[1] |
1 |
[1] |
| Estimated Fair Value |
99 |
[1] |
94 |
[1] |
|
Duke Energy Indiana [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
1 |
|
1 |
|
|
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
26 |
|
24 |
|
| Gross Unrealized Holding Losses |
|
|
|
|
| Estimated Fair Value |
68 |
|
65 |
|
|
Duke Energy Indiana [Member] | Other Classification [Member] | Municipal Bonds [Member]
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Gross Unrealized Holding Gains |
|
|
|
|
| Gross Unrealized Holding Losses |
|
|
1 |
|
| Estimated Fair Value |
$ 30 |
|
$ 28 |
|
|
|
|