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Supplemental Guarantor Information (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | $ 2,762 | $ 2,592 |
New Financing- |  |  |  |  |
Long-term debt |  |  | 4,050 | 521 |
Short-term borrowings, net |  |  | 0 | 1,275 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (1,711) | (1,017) |
Other |  |  | (67) | (17) |
Net cash (used for) provided from financing activities |  |  | (381) | 304 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions | $ (593) | $ (664) | (1,847) | (2,156) |
Nuclear fuel |  |  | (156) | (195) |
Sales of investment securities held in trusts |  |  | 1,923 | 1,361 |
Purchases of investment securities held in trusts |  |  | (1,995) | (1,437) |
Other |  |  | 24 | 52 |
Net cash used for investing activities |  |  | (2,181) | (2,476) |
Net change in cash and cash equivalents |  |  | 200 | 420 |
Cash and cash equivalents at beginning of period |  |  | 199 | 131 | $ 131
Cash and cash equivalents at end of period | 399 | 551 | 399 | 551 | 199
Eliminations |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | (13) | (12) |
New Financing- |  |  |  |  |
Long-term debt |  |  |  | 0 |
Short-term borrowings, net |  |  | (259) | (692) |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | 13 | 12 |
Other |  |  | 0 | 0 |
Net cash (used for) provided from financing activities |  |  | (246) | (680) |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | 0 | 0 |
Nuclear fuel |  |  | 0 | 0 |
Sales of investment securities held in trusts |  |  | 0 | 0 |
Purchases of investment securities held in trusts |  |  | 0 | 0 |
Loans to affiliated companies, net |  |  | 259 | 692 |
Other |  |  | 0 | 0 |
Net cash used for investing activities |  |  | 259 | 692 |
Net change in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at beginning of period |  |  | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0 | 0 | 0
FES |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | (463) | (605) |
New Financing- |  |  |  |  |
Long-term debt |  |  |  | 0 |
Short-term borrowings, net |  |  | 330 | 701 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | 0 | 0 |
Other |  |  | 0 | 0 |
Net cash (used for) provided from financing activities |  |  | 330 | 701 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (1) | (28) |
Nuclear fuel |  |  | 0 | 0 |
Sales of investment securities held in trusts |  |  | 0 | 0 |
Purchases of investment securities held in trusts |  |  | 0 | 0 |
Loans to affiliated companies, net |  |  | 137 | (87) |
Other |  |  | (3) | 19 |
Net cash used for investing activities |  |  | 133 | (96) |
Net change in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at beginning of period |  |  | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0 | 0 | 0
FG |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | 387 | 402 |
New Financing- |  |  |  |  |
Long-term debt |  |  |  | 186 |
Short-term borrowings, net |  |  | 14 | 92 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (171) | (211) |
Other |  |  | (5) | (6) |
Net cash (used for) provided from financing activities |  |  | (162) | 61 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (46) | (171) |
Nuclear fuel |  |  | 0 | 0 |
Sales of investment securities held in trusts |  |  | 0 | 0 |
Purchases of investment securities held in trusts |  |  | 0 | 0 |
Loans to affiliated companies, net |  |  | (179) | (292) |
Other |  |  | 0 | 0 |
Net cash used for investing activities |  |  | (225) | (463) |
Net change in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at beginning of period |  |  | 2 | 2 | 2
Cash and cash equivalents at end of period | 2 | 2 | 2 | 2 | 2
NG |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | 547 | 820 |
New Financing- |  |  |  |  |
Long-term debt |  |  |  | 285 |
Short-term borrowings, net |  |  | 0 | 0 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (5) | (304) |
Other |  |  | 0 | (2) |
Net cash (used for) provided from financing activities |  |  | (5) | (21) |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (154) | (233) |
Nuclear fuel |  |  | (156) | (195) |
Sales of investment securities held in trusts |  |  | 834 | 576 |
Purchases of investment securities held in trusts |  |  | (878) | (619) |
Loans to affiliated companies, net |  |  | (188) | (328) |
Other |  |  | 0 | 0 |
Net cash used for investing activities |  |  | (542) | (799) |
Net change in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at beginning of period |  |  | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0 | 0 | 0
Consolidated |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH (USED FOR) PROVIDED FROM OPERATING ACTIVITIES |  |  | 458 | 605 |
New Financing- |  |  |  |  |
Long-term debt |  |  | 0 | 471 |
Short-term borrowings, net |  |  | 85 | 101 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (163) | (503) |
Other |  |  | (5) | (8) |
Net cash (used for) provided from financing activities |  |  | (83) | 61 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (201) | (432) |
Nuclear fuel |  |  | (156) | (195) |
Sales of investment securities held in trusts |  |  | 834 | 576 |
Purchases of investment securities held in trusts |  |  | (878) | (619) |
Loans to affiliated companies, net |  |  | 29 | (15) |
Other |  |  | (3) | 19 |
Net cash used for investing activities |  |  | (375) | (666) |
Net change in cash and cash equivalents |  |  | 0 | 0 |
Cash and cash equivalents at beginning of period |  |  | 2 | 2 | 2
Cash and cash equivalents at end of period | $ 2 | $ 2 | $ 2 | $ 2 | $ 2

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