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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
The measurement date used to determine pension and other postretirement benefit obligations is December 31. Data related to the changes in the projected benefit obligation for pension benefits and the accumulated benefit obligation for other postretirement benefits are presented below.
 
 
The Company
 
Consolidated SCE&G
 
 
Pension Benefits

Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017

2016

2017

2016
 
2017
 
2016
 
2017
 
2016
Benefit obligation, January 1
 
$
904.3

 
$
855.4

 
$
274.7

 
$
253.6

 
$
768.4

 
$
724.0

 
$
207.2

 
$
191.7

Service cost
 
21.7

 
20.7

 
4.5

 
4.4

 
18.1

 
16.9

 
3.7

 
3.6

Interest cost
 
37.4

 
39.4

 
11.5

 
12.1

 
31.9

 
33.4

 
9.5

 
9.9

Plan participants’ contributions
 
—

 
—

 
1.3

 
1.7

 
—

 
—

 
1.1

 
1.3

Actuarial (gain) loss
 
42.2

 
45.0

 
9.7

 
14.0

 
36.6

 
41.8

 
6.8

 
11.5

Benefits paid
 
(72.4
)
 
(56.2
)
 
(12.5
)
 
(11.1
)
 
(62.0
)
 
(47.7
)
 
(10.3
)
 
(9.1
)
Amounts Funded to parent
 
n/a

 
n/a

 
n/a

 
n/a

 
—

 
—

 
(1.4
)
 
(1.7
)
Benefit obligation, December 31
 
$
933.2

 
$
904.3

 
$
289.2

 
$
274.7

 
$
793.0

 
$
768.4

 
$
216.6

 
$
207.2
Schedule of Assumptions Used to Determine Benefit Obligations [Table Text Block]
Significant assumptions used to determine the above benefit obligations are as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
2017
 
2016
 
2017
 
2016
Annual discount rate used to determine benefit obligation
3.71
%
 
4.22
%
 
3.74
%
 
4.30
%
Assumed annual rate of future salary increases for projected benefit obligation
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
Schedule of Net Funded Status [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Fair value of plan assets
 
$
849.6

 
$
793.6

 
—

 
—

 
$
781.3

 
$
732.9

 
—

 
—

Benefit obligation
 
933.2

 
904.3

 
$
289.2

 
$
274.7

 
793.0

 
768.4

 
$
216.6

 
$
207.2

Funded status
 
$
(83.6
)
 
$
(110.7
)
 
$
(289.2
)
 
$
(274.7
)
 
$
(11.7
)
 
$
(35.5
)
 
$
(216.6
)
 
$
(207.2
)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts recognized on the consolidated balance sheets were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Current liability
 
—

 
—

 
$
(13.5
)
 
$
(12.6
)
 
—

 
—

 
$
(10.8
)
 
$
(10.4
)
Noncurrent liability
 
$
(83.6
)
 
$
(110.7
)
 
(275.7
)
 
(262.1
)
 
$
(11.7
)
 
$
(35.5
)
 
(205.8
)
 
(196.8
)
Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in OCI (net of tax) were as follows:
The Company
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Current year actuarial (gain) loss
 
$
(1.0
)
 
$
0.6

 
$
2.7

 
$
1.1

 
$
0.8

 
$
(1.2
)
Amortization of actuarial losses
 
(0.6
)
 
(0.6
)
 
(0.4
)
 
(0.1
)
 
—

 
(0.1
)
Amortization of prior service cost
 
—

 
(0.1
)
 
(0.1
)
 
—

 
—

 
(0.1
)
Total recognized in OCI
 
$
(1.6
)
 
$
(0.1
)
 
$
2.2

 
$
1.0

 
$
0.8

 
$
(1.4
)
Schedule of defined benefit plan, amounts recognized in regulatory assets [Table Text Block]
Amounts recognized in regulatory assets were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss
 
$
194.8

 
$
236.1

 
$
43.3

 
$
34.7

 
$
171.4

 
$
208.8

 
$
35.9

 
$
29.3

Prior service cost
 
1.2

 
2.5

 
—

 
—

 
1.0

 
2.2

 
—

 
—

Total
 
$
196.0

 
$
238.6

 
$
43.3

 
$
34.7

 
$
172.4

 
$
211.0

 
$
35.9

 
$
29.3
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Pension Benefits

 
The Company
 
Consolidated SCE&G
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Fair value of plan assets, January 1
 
$
793.6

 
$
781.7

 
$
732.9

 
$
720.1

Actual return on plan assets
 
128.4

 
68.1

 
110.4

 
60.5

Benefits paid
 
(72.4
)
 
(56.2
)
 
(62.0
)
 
(47.7
)
Fair value of plan assets, December 31
 
$
849.6

 
$
793.6

 
$
781.3

 
$
732.9
Schedule of Allocation of Plan Assets [Table Text Block]

The pension plan asset allocation at December 31, 2017 and 2016 and the target allocation for 2018 are as follows: 
 
 
Percentage of Plan Assets
 
 
Target
Allocation
 

December 31,
Asset Category
 
2018
 
2017
 
2016
Equity Securities
 
58
%
 
58
%
 
57
%
Fixed Income
 
33
%
 
31
%
 
32
%
Hedge Funds
 
9
%
 
11
%
 
11
%
Schedule of Fair Value of Plan, Assets by Measurement Levels [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Investments with fair value measure at Level 2:
 
 
 
 
 
 
 
 
   Mutual funds
 
$
120

 
$
125

 
$
110

 
$
115

   Short-term investment vehicles
 
17

 
16

 
16

 
15

   US Treasury securities
 
15

 
18

 
14

 
17

   Corporate debt securities
 
91

 
82

 
84

 
76

   Municipals
 
17

 
14

 
15

 
13

Total assets in the fair value hierarchy
 
260

 
255

 
239

 
236

 
 
 
 
 
 
 
 
 
Investments at net asset value:
 
 
 
 
 
 
 
 
   Common collective trust
 
498

 
453

 
458

 
418

   Joint venture interests
 
92

 
86

 
84

 
79

Total investments at fair value
 
$
850

 
$
794

 
$
781

 
$
733
Schedule of Expected Benefit Payments [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
2018
 
$
66.9

 
$
13.8

 
$
66.9

 
$
11.0

2019
 
64.6

 
14.6

 
64.6

 
11.7

2020
 
63.9

 
15.4

 
63.9

 
12.3

2021
 
66.5

 
16.0

 
66.5

 
12.8

2022
 
72.0

 
16.5

 
72.0

 
13.1

2023-2027
 
303.0

 
87.3

 
303.0

 
69.6
Schedule of Net Benefit Costs [Table Text Block]
The Company
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Service cost
 
$
21.7

 
$
20.7

 
$
24.1

 
$
4.5

 
$
4.4

 
$
5.3

Interest cost
 
37.4

 
39.4

 
38.2

 
11.5

 
12.1

 
11.4

Expected return on assets
 
(54.7
)
 
(55.9
)
 
(62.0
)
 
n/a

 
n/a

 
n/a

Prior service cost amortization
 
1.6

 
3.9

 
4.1

 
—

 
0.3

 
0.4

Amortization of actuarial losses
 
16.3

 
14.8

 
13.6

 
1.0

 
0.5

 
2.1

Net periodic benefit cost
 
$
22.3

 
$
22.9

 
$
18.0

 
$
17.0

 
$
17.3

 
$
19.2
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in accumulated other comprehensive loss were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss
 
$
8.8

 
$
10.4

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0

Prior service cost
 
0.1

 
0.1

 
—

 
—

 
—

 
—

 
—

 
—

Total
 
$
8.9

 
$
10.5

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0
Schedule of defined benefit plan, Other changes in plan assets recognized in regulatory assets [Table Text Block]
Other changes in plan assets and benefit obligations recognized in regulatory assets were as follows:
The Company
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Current year actuarial (gain) loss
 
$
(27.1
)
 
$
29.4

 
$
9.2

 
$
9.4

 
$
11.1

 
$
(18.0
)
Amortization of actuarial losses
 
(14.1
)
 
(12.7
)
 
(11.9
)
 
(0.8
)
 
(0.4
)
 
(1.8
)
Amortization of prior service cost
 
(1.4
)
 
(3.4
)
 
(3.7
)
 
—

 
(0.3
)
 
(0.3
)
Total recognized in regulatory assets
 
$
(42.6
)
 
$
13.3

 
$
(6.4
)
 
$
8.6

 
$
10.4

 
$
(20.1
)
Schedule of Assumptions Used in Determining Net Periodic Benefit Cost [Table Text Block]
 
Pension Benefits
 
Other Postretirement Benefits
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Discount rate
4.22
%
 
4.68
%
 
4.20
%
 
4.30
%
 
4.78
%
 
4.30
%
Expected return on plan assets
7.25
%
 
7.50
%
 
7.50
%
 
n/a

 
n/a

 
n/a

Rate of compensation increase
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
Health care cost trend rate
n/a

 
n/a

 
n/a

 
6.60
%
 
7.00
%
 
7.00
%
Ultimate health care cost trend rate
n/a

 
n/a

 
n/a

 
5.00
%
 
5.00
%
 
5.00
%
Year achieved
n/a

 
n/a

 
n/a

 
2021

 
2021

 
2020
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2018 are as follows for the Company. For Consolidated SCE&G such amounts are insignificant:
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
Actuarial loss
 
$
0.5

 
$
0.1
Schedule of amounts in regulatory assets to be recognized over the next fiscal year [Table Text Block]
The estimated amounts to be amortized from regulatory assets into net periodic benefit cost in 2018 are as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Actuarial loss
 
$
10.2

 
$
1.8

 
$
9.0

 
$
1.5

Prior service cost
 
0.4

 
—

 
0.4

 
—

Total
 
$
10.6

 
$
1.8

 
$
9.4

 
$
1.5
SCE&G  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
The measurement date used to determine pension and other postretirement benefit obligations is December 31. Data related to the changes in the projected benefit obligation for pension benefits and the accumulated benefit obligation for other postretirement benefits are presented below.
 
 
The Company
 
Consolidated SCE&G
 
 
Pension Benefits

Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017

2016

2017

2016
 
2017
 
2016
 
2017
 
2016
Benefit obligation, January 1
 
$
904.3

 
$
855.4

 
$
274.7

 
$
253.6

 
$
768.4

 
$
724.0

 
$
207.2

 
$
191.7

Service cost
 
21.7

 
20.7

 
4.5

 
4.4

 
18.1

 
16.9

 
3.7

 
3.6

Interest cost
 
37.4

 
39.4

 
11.5

 
12.1

 
31.9

 
33.4

 
9.5

 
9.9

Plan participants’ contributions
 
—

 
—

 
1.3

 
1.7

 
—

 
—

 
1.1

 
1.3

Actuarial (gain) loss
 
42.2

 
45.0

 
9.7

 
14.0

 
36.6

 
41.8

 
6.8

 
11.5

Benefits paid
 
(72.4
)
 
(56.2
)
 
(12.5
)
 
(11.1
)
 
(62.0
)
 
(47.7
)
 
(10.3
)
 
(9.1
)
Amounts Funded to parent
 
n/a

 
n/a

 
n/a

 
n/a

 
—

 
—

 
(1.4
)
 
(1.7
)
Benefit obligation, December 31
 
$
933.2

 
$
904.3

 
$
289.2

 
$
274.7

 
$
793.0

 
$
768.4

 
$
216.6

 
$
207.2
Schedule of Assumptions Used to Determine Benefit Obligations [Table Text Block]
Significant assumptions used to determine the above benefit obligations are as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
2017
 
2016
 
2017
 
2016
Annual discount rate used to determine benefit obligation
3.71
%
 
4.22
%
 
3.74
%
 
4.30
%
Assumed annual rate of future salary increases for projected benefit obligation
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
Schedule of Net Funded Status [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Fair value of plan assets
 
$
849.6

 
$
793.6

 
—

 
—

 
$
781.3

 
$
732.9

 
—

 
—

Benefit obligation
 
933.2

 
904.3

 
$
289.2

 
$
274.7

 
793.0

 
768.4

 
$
216.6

 
$
207.2

Funded status
 
$
(83.6
)
 
$
(110.7
)
 
$
(289.2
)
 
$
(274.7
)
 
$
(11.7
)
 
$
(35.5
)
 
$
(216.6
)
 
$
(207.2
)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts recognized in accumulated other comprehensive loss were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss
 
$
8.8

 
$
10.4

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0

Prior service cost
 
0.1

 
0.1

 
—

 
—

 
—

 
—

 
—

 
—

Total
 
$
8.9

 
$
10.5

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0
Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Consolidated SCE&G
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Current year actuarial (gain) loss
 
$
0.3

 
—

 
$
0.2

 
$
0.5

 
$
0.3

 
$
(0.3
)
Amortization of actuarial losses
 
(0.1
)
 
$
(0.1
)
 
(0.1
)
 
—

 
—

 
—

Amortization of prior service cost
 
—

 
—

 
(0.1
)
 
—

 
—

 
—

Total recognized in OCI
 
$
0.2

 
$
(0.1
)
 
—

 
$
0.5

 
$
0.3

 
$
(0.3
)
Schedule of defined benefit plan, amounts recognized in regulatory assets [Table Text Block]
Amounts recognized in regulatory assets were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss
 
$
194.8

 
$
236.1

 
$
43.3

 
$
34.7

 
$
171.4

 
$
208.8

 
$
35.9

 
$
29.3

Prior service cost
 
1.2

 
2.5

 
—

 
—

 
1.0

 
2.2

 
—

 
—

Total
 
$
196.0

 
$
238.6

 
$
43.3

 
$
34.7

 
$
172.4

 
$
211.0

 
$
35.9

 
$
29.3
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Pension Benefits

 
The Company
 
Consolidated SCE&G
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Fair value of plan assets, January 1
 
$
793.6

 
$
781.7

 
$
732.9

 
$
720.1

Actual return on plan assets
 
128.4

 
68.1

 
110.4

 
60.5

Benefits paid
 
(72.4
)
 
(56.2
)
 
(62.0
)
 
(47.7
)
Fair value of plan assets, December 31
 
$
849.6

 
$
793.6

 
$
781.3

 
$
732.9
Schedule of Allocation of Plan Assets [Table Text Block]
The pension plan asset allocation at December 31, 2017 and 2016 and the target allocation for 2018 are as follows: 
 
 
Percentage of Plan Assets
 
 
Target
Allocation
 

December 31,
Asset Category
 
2018
 
2017
 
2016
Equity Securities
 
58
%
 
58
%
 
57
%
Fixed Income
 
33
%
 
31
%
 
32
%
Hedge Funds
 
9
%
 
11
%
 
11
%
Schedule of Fair Value of Plan, Assets by Measurement Levels [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Investments with fair value measure at Level 2:
 
 
 
 
 
 
 
 
   Mutual funds
 
$
120

 
$
125

 
$
110

 
$
115

   Short-term investment vehicles
 
17

 
16

 
16

 
15

   US Treasury securities
 
15

 
18

 
14

 
17

   Corporate debt securities
 
91

 
82

 
84

 
76

   Municipals
 
17

 
14

 
15

 
13

Total assets in the fair value hierarchy
 
260

 
255

 
239

 
236

 
 
 
 
 
 
 
 
 
Investments at net asset value:
 
 
 
 
 
 
 
 
   Common collective trust
 
498

 
453

 
458

 
418

   Joint venture interests
 
92

 
86

 
84

 
79

Total investments at fair value
 
$
850

 
$
794

 
$
781

 
$
733
Schedule of Expected Benefit Payments [Table Text Block]
 
 
The Company
 
Consolidated SCE&G
Millions of dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
2018
 
$
66.9

 
$
13.8

 
$
66.9

 
$
11.0

2019
 
64.6

 
14.6

 
64.6

 
11.7

2020
 
63.9

 
15.4

 
63.9

 
12.3

2021
 
66.5

 
16.0

 
66.5

 
12.8

2022
 
72.0

 
16.5

 
72.0

 
13.1

2023-2027
 
303.0

 
87.3

 
303.0

 
69.6
Schedule of Net Benefit Costs [Table Text Block]
Consolidated SCE&G
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Service cost
 
$
18.1

 
$
16.9

 
$
19.3

 
$
3.7

 
$
3.6

 
$
4.4

Interest cost
 
31.9

 
33.4

 
32.2

 
9.5

 
9.9

 
9.4

Expected return on assets
 
(46.7
)
 
(47.4
)
 
(52.2
)
 
n/a

 
n/a

 
n/a

Prior service cost amortization
 
1.4

 
3.4

 
3.4

 
—

 
0.3

 
0.3

Amortization of actuarial losses
 
13.9

 
12.5

 
11.4

 
0.8

 
0.4

 
1.7

Net periodic benefit cost
 
$
18.6

 
$
18.8

 
$
14.1

 
$
14.0

 
$
14.2

 
$
15.8
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in accumulated other comprehensive loss were as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss
 
$
8.8

 
$
10.4

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0

Prior service cost
 
0.1

 
0.1

 
—

 
—

 
—

 
—

 
—

 
—

Total
 
$
8.9

 
$
10.5

 
$
3.5

 
$
2.5

 
$
2.1

 
$
1.9

 
$
1.5

 
$
1.0
Schedule of defined benefit plan, Other changes in plan assets recognized in regulatory assets [Table Text Block]
Consolidated SCE&G
 
Pension Benefits
 
Other Postretirement Benefits
Millions of dollars
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Current year actuarial (gain) loss
 
$
(24.8
)
 
$
26.3

 
$
12.2

 
$
7.3

 
$
9.2

 
$
(14.0
)
Amortization of actuarial losses
 
(12.5
)
 
(11.2
)
 
(10.4
)
 
(0.7
)
 
(0.3
)
 
(1.5
)
Amortization of prior service cost
 
(1.3
)
 
(3.0
)
 
(3.1
)
 
—

 
(0.2
)
 
(0.3
)
Total recognized in regulatory assets
 
$
(38.6
)
 
$
12.1

 
$
(1.3
)
 
$
6.6

 
$
8.7

 
$
(15.8
)
Schedule of Assumptions Used in Determining Net Periodic Benefit Cost [Table Text Block]
 
Pension Benefits
 
Other Postretirement Benefits
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Discount rate
4.22
%
 
4.68
%
 
4.20
%
 
4.30
%
 
4.78
%
 
4.30
%
Expected return on plan assets
7.25
%
 
7.50
%
 
7.50
%
 
n/a

 
n/a

 
n/a

Rate of compensation increase
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
 
3.00
%
Health care cost trend rate
n/a

 
n/a

 
n/a

 
6.60
%
 
7.00
%
 
7.00
%
Ultimate health care cost trend rate
n/a

 
n/a

 
n/a

 
5.00
%
 
5.00
%
 
5.00
%
Year achieved
n/a

 
n/a

 
n/a

 
2021

 
2021

 
2020
Schedule of amounts in regulatory assets to be recognized over the next fiscal year [Table Text Block]
The estimated amounts to be amortized from regulatory assets into net periodic benefit cost in 2018 are as follows:
 
 
The Company
 
Consolidated SCE&G
Millions of Dollars
 
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Actuarial loss
 
$
10.2

 
$
1.8

 
$
9.0

 
$
1.5

Prior service cost
 
0.4

 
—

 
0.4

 
—

Total
 
$
10.6

 
$
1.8

 
$
9.4

 
$
1.5