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Supplemental Guarantor Information (Details 2) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | $ 1,482 | $ 1,472 |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | 0 | 1,225 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (735) | (581) |
Short-term borrowings, net |  |  | (2,450) | 0 |
Other |  |  | (52) | 24 |
Net cash provided from (used for) financing activities |  |  | (56) | 363 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions | $ (666) | $ (794) | (1,254) | (1,492) |
Nuclear fuel |  |  | (134) | (188) |
Sales of investment securities held in trusts |  |  | 1,257 | 1,024 |
Purchases of investment securities held in trusts |  |  | (1,305) | (1,073) |
Other |  |  | 4 | 25 |
Net cash used for investing activities |  |  | (1,511) | (1,767) |
Net change in cash and cash equivalents |  |  | (85) | 68 |
Cash and cash equivalents at beginning of period |  |  | 199 | 131 | $ 131
Cash and cash equivalents at end of period | 114 | 199 | 114 | 199 | 199
Eliminations |  |  |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | (13) | (12) |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | (98) | (209) |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | 13 | 12 |
Short-term borrowings, net |  |  | 122 |  |
Other |  |  | 0 | 0 |
Net cash provided from (used for) financing activities |  |  | 37 | (197) |
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 |
Cash investments |  |  |  | 0 |
Loans to affiliated companies, net |  |  | (24) | 209 |
Other |  |  | 0 | 0 |
Net cash used for investing activities |  |  | (24) | 209 |
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 PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | (411) | (335) |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | 272 | 322 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | 0 | 0 |
Short-term borrowings, net |  |  | 0 |  |
Other |  |  | (1) | (1) |
Net cash provided from (used for) financing activities |  |  | 271 | 321 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | 0 | (27) |
Nuclear fuel |  |  | 0 | 0 |
Sales of investment securities held in trusts |  |  | 0 | 0 |
Purchases of investment securities held in trusts |  |  | 0 | 0 |
Cash investments |  |  |  | 11 |
Loans to affiliated companies, net |  |  | 140 | 22 |
Other |  |  | 0 | 8 |
Net cash used for investing activities |  |  | 140 | 14 |
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 PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | 340 | 308 |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | 0 | 89 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (171) | (12) |
Short-term borrowings, net |  |  | (122) |  |
Other |  |  | (3) | (2) |
Net cash provided from (used for) financing activities |  |  | (296) | 75 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (30) | (126) |
Nuclear fuel |  |  | 0 | 0 |
Sales of investment securities held in trusts |  |  | 0 | 0 |
Purchases of investment securities held in trusts |  |  | 0 | 0 |
Cash investments |  |  |  | 0 |
Loans to affiliated companies, net |  |  | (14) | (257) |
Other |  |  | 0 | 0 |
Net cash used for investing activities |  |  | (44) | (383) |
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 PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | 379 | 596 |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | 0 | 8 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (5) | (245) |
Short-term borrowings, net |  |  | 0 |  |
Other |  |  | 0 | 0 |
Net cash provided from (used for) financing activities |  |  | (5) | (237) |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (139) | (182) |
Nuclear fuel |  |  | (134) | (188) |
Sales of investment securities held in trusts |  |  | 437 | 441 |
Purchases of investment securities held in trusts |  |  | (466) | (467) |
Cash investments |  |  |  | 0 |
Loans to affiliated companies, net |  |  | (73) | 37 |
Other |  |  | 1 | 0 |
Net cash used for investing activities |  |  | (374) | (359) |
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 PROVIDED FROM (USED FOR) OPERATING ACTIVITIES |  |  | 295 | 557 |
New Financing- |  |  |  |  |
Short-term borrowings, net |  |  | 174 | 210 |
Redemptions and Repayments- |  |  |  |  |
Long-term debt |  |  | (163) | (245) |
Short-term borrowings, net |  |  | 0 |  |
Other |  |  | (4) | (3) |
Net cash provided from (used for) financing activities |  |  | 7 | (38) |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  | (169) | (335) |
Nuclear fuel |  |  | (134) | (188) |
Sales of investment securities held in trusts |  |  | 437 | 441 |
Purchases of investment securities held in trusts |  |  | (466) | (467) |
Cash investments |  |  | 0 | 11 |
Loans to affiliated companies, net |  |  | 29 | 11 |
Other |  |  | 1 | 8 |
Net cash used for investing activities |  |  | (302) | (519) |
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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