Derivative Instruments (Details Textuals)
$ in Millions |
3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2016
USD ($)
agreement
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
USD ($)
agreement
|
Sep. 30, 2015
USD ($)
|
Dec. 31, 2015
USD ($)
|
| Derivative [Line Items] |
|
|
|
|
|
| Unamortized gains or losses associated with designated cash flow hedges |
$ 11
|
|
$ 11
|
|
$ 11
|
| Collateral received |
$ 22
|
|
$ 22
|
|
0
|
| Possible adverse change in quoted market prices of derivative instruments |
10.00%
|
|
10.00%
|
|
|
| Possible increase (decrease) net income due to ten percent adverse change in commodity prices |
|
|
$ (37)
|
|
|
| Cash Flow Hedges |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
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| Less than 1 million dollar loss on cash flow hedge expected to be reclassified to earnings in next twelve months |
|
|
1
|
|
|
| Unamortized gains or losses associated with prior interest rate hedges |
$ 35
|
|
35
|
|
42
|
| Gains (losses) to be amortized to interest expenses during next twelve months |
|
|
(8)
|
|
|
| Fair Value Hedging |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Gains (losses) to be amortized to interest expenses during next twelve months |
|
|
$ 8
|
|
|
| Number of fixed-for-floating interest rate swap agreements outstanding | agreement |
0
|
|
0
|
|
|
| Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements |
$ 12
|
|
$ 12
|
|
20
|
| Reclassifications from long-term debt |
2
|
$ 3
|
8
|
$ 9
|
|
| Commodity contracts |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Net asset position under commodity derivative contracts |
103
|
|
103
|
|
|
| Collateral received |
22
|
|
22
|
|
0
|
| Commodity contracts | FES |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Collateral posted |
9
|
|
9
|
|
|
| Collateral received |
22
|
|
22
|
|
|
| NUGs |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Collateral received |
0
|
|
0
|
|
0
|
| Liability position |
118
|
|
118
|
|
|
| FTRs |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Net asset position under commodity derivative contracts |
6
|
|
6
|
|
|
| Collateral received |
0
|
|
0
|
|
$ 0
|
| FTRs | FES |
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Net asset position under commodity derivative contracts |
2
|
|
2
|
|
|
| Collateral posted |
$ 7
|
|
$ 7
|
|
|