v2.4.0.6

Employee Benefit Plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |
Employee Savings Plan contributions |
(in millions) | Duke Energy |  | Duke Energy Carolinas |  | Progress Energy |  | Duke Energy Progress |  | Duke Energy Florida |  | Duke Energy Ohio |  | Duke Energy Indiana
For the three months ended March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| 2013 | $ | 41 |  | $ | 14 |  | $ | 12 |  | $ | 6 |  | $ | 4 |  | $ | 1 |  | $ | 2
| 2012 |  | 28 |  |  | 11 |  |  | 12 |  |  | 6 |  |  | 4 |  |  | 1 |  |  | 2
Qualified Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Components Of net periodic pension costs |
|  | Three Months Ended March 31, 2013
(in millions) | Duke Energy |  | Duke Energy Carolinas |  | Progress Energy |  | Duke Energy Progress |  | Duke Energy Florida |  | Duke Energy Ohio |  | Duke Energy Indiana
Service cost | $ | 42 |  | $ | 12 |  | $ | 15 |  | $ | 5 |  | $ | 8 |  | $ | 2 |  | $ | 3
Interest cost on project benefit obligation |  | 80 |  |  | 20 |  |  | 29 |  |  | 13 |  |  | 13 |  |  | 5 |  |  | 7
Expected return on plan assets |  | (137) |  |  | (37) |  |  | (50) |  |  | (23) |  |  | (22) |  |  | (8) |  |  | (11)
Amortization of prior service credit |  | (3) |  |  | (2) |  |  | (1) |  |  | - |  |  | - |  |  | - |  |  | -
Amortization of actuarial loss |  | 61 |  |  | 15 |  |  | 25 |  |  | 11 |  |  | 12 |  |  | 3 |  |  | 6
Other |  | 2 |  |  | 1 |  |  | 1 |  |  | - |  |  | - |  |  | - |  |  | -
Net periodic pension costs(a)(b) | $ | 45 |  | $ | 9 |  | $ | 19 |  | $ | 6 |  | $ | 11 |  | $ | 2 |  | $ | 5
|  | Three Months Ended March 31, 2012
(in millions) | Duke Energy |  | Duke Energy Carolinas |  | Progress Energy |  | Duke Energy Progress |  | Duke Energy Florida |  | Duke Energy Ohio |  | Duke Energy Indiana
Service cost | $ | 23 |  | $ | 9 |  | $ | 15 |  | $ | 6 |  | $ | 7 |  | $ | 2 |  | $ | 2
Interest cost on project benefit obligation |  | 61 |  |  | 23 |  |  | 31 |  |  | 14 |  |  | 13 |  |  | 8 |  |  | 8
Expected return on plan assets |  | (94) |  |  | (36) |  |  | (46) |  |  | (24) |  |  | (20) |  |  | (11) |  |  | (12)
Amortization of prior service cost |  | 1 |  |  | - |  |  | 2 |  |  | 2 |  |  | - |  |  | - |  |  | 1
Amortization of actuarial loss |  | 24 |  |  | 11 |  |  | 22 |  |  | 9 |  |  | 11 |  |  | 2 |  |  | 3
Other |  | 1 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Net periodic pension costs(a)(b) | $ | 16 |  | $ | 7 |  | $ | 24 |  | $ | 7 |  | $ | 11 |  | $ | 1 |  | $ | 2
Other Post-Retirement Benefit plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Components Of net periodic pension costs |
|  | Three Months Ended March 31, 2013
(in millions) | Duke Energy |  | Duke Energy Carolinas |  | Progress Energy |  | Duke Energy Progress |  | Duke Energy Florida |  | Duke Energy Ohio |  | Duke Energy Indiana
Service cost | $ | 7 |  | $ | 1 |  |  | 6 |  | $ | 3 |  | $ | 2 |  | $ | - |  | $ | -
Interest cost on accumulated post-retirement benefit obligation |  | 18 |  |  | 3 |  |  | 11 |  |  | 6 |  |  | 4 |  |  | - |  |  | 1
Expected return on plan assets |  | (3) |  |  | (3) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Amortization of prior service credit |  | (3) |  |  | (2) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Amortization of actuarial loss (gain) |  | 13 |  |  | 1 |  |  | 14 |  |  | 9 |  |  | 4 |  |  | - |  |  | (1)
Net periodic costs(a)(b) | $ | 32 |  | $ | - |  | $ | 31 |  | $ | 18 |  | $ | 10 |  | $ | - |  | $ | -
|  | Three Months Ended March 31, 2012
(in millions) | Duke Energy |  | Duke Energy Carolinas |  | Progress Energy |  | Duke Energy Progress |  | Duke Energy Florida |  | Duke Energy Ohio |  | Duke Energy Indiana
Service cost | $ | 2 |  | $ | 1 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | - |  | $ | -
Interest cost on accumulated post-retirement benefit obligation |  | 8 |  |  | 4 |  |  | 10 |  |  | 5 |  |  | 4 |  |  | 1 |  |  | 2
Expected return on plan assets |  | (4) |  |  | (3) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Amortization of prior service credit |  | (2) |  |  | (1) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Amortization of net transition liability |  | 2 |  |  | 1 |  |  | 1 |  |  | - |  |  | 1 |  |  | - |  |  | -
Amortization of actuarial (gain) loss |  | (2) |  |  | 1 |  |  | 6 |  |  | 3 |  |  | 3 |  |  | (1) |  |  | -
Net periodic costs(a)(b) | $ | 4 |  | $ | 3 |  | $ | 20 |  | $ | 9 |  | $ | 9 |  | $ | - |  | $ | 2

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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