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Supplemental Guarantor Information (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | $ 3,808 | $ 3,383 | $ 3,460
New Financing- |  |  |
Long-term debt | 4,675 | 1,976 | 1,311
Short-term borrowings, net | 0 | 975 | 0
Redemptions and Repayments- |  |  |
Long-term debt | (2,291) | (2,331) | (879)
Short-term borrowings, net | (2,375) | 0 | (91)
Common stock dividend payments | (639) | (611) | (607)
Other | (72) | (43) | (26)
Net cash used for financing activities | (702) | (34) | (292)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | (2,587) | (2,835) | (2,704)
Nuclear fuel | (254) | (232) | (190)
Proceeds from asset sales | 388 | 15 | 20
Sales of investment securities held in trusts | 2,170 | 1,678 | 1,534
Purchases of investment securities held in trusts | (2,268) | (1,789) | (1,648)
Other | 7 | 27 | 8
Net cash used for investing activities | (2,716) | (3,281) | (3,122)
Net change in cash and cash equivalents | 390 | 68 | 46
Cash and cash equivalents at beginning of period | 199 | 131 | 85
Cash and cash equivalents at end of period | 589 | 199 | 131
Eliminations |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | (26) | (25) | (24)
New Financing- |  |  |
Long-term debt |  | 0 | 0
Short-term borrowings, net | (271) | (941) | (863)
Redemptions and Repayments- |  |  |
Long-term debt | 26 | 25 | 24
Short-term borrowings, net |  |  | (98)
Common stock dividend payments |  |  | 0
Other | 0 | 0 | 0
Net cash used for financing activities | (245) | (916) | (937)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | 0 | 0 | 0
Nuclear fuel | 0 | 0 | 0
Proceeds from asset sales |  | 0 | 0
Sales of investment securities held in trusts | 0 | 0 | 0
Purchases of investment securities held in trusts | 0 | 0 | 0
Cash investments | 0 | 0 | 0
Loans to affiliated companies, net | 271 | 941 | 961
Other |  | 0 | 0
Net cash used for investing activities | 271 | 941 | 961
Net change in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0
FES |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | (485) | (842) | (637)
New Financing- |  |  |
Long-term debt |  | 0 | 0
Short-term borrowings, net | 356 | 948 | 796
Redemptions and Repayments- |  |  |
Long-term debt | 0 | 0 | (17)
Short-term borrowings, net |  |  | 0
Common stock dividend payments |  |  | (70)
Other | (1) | 0 | 0
Net cash used for financing activities | 355 | 948 | 709
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | (2) | (30) | (5)
Nuclear fuel | 0 | 0 | 0
Proceeds from asset sales |  | 9 | 10
Sales of investment securities held in trusts | 0 | 0 | 0
Purchases of investment securities held in trusts | 0 | 0 | 0
Cash investments | (3) | 10 | (10)
Loans to affiliated companies, net | 135 | (95) | (67)
Other |  | 0 | 0
Net cash used for investing activities | 130 | (106) | (72)
Net change in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0
FG |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | 516 | 550 | 552
New Financing- |  |  |
Long-term debt |  | 186 | 45
Short-term borrowings, net | (81) | 94 | 67
Redemptions and Repayments- |  |  |
Long-term debt | (184) | (224) | (70)
Short-term borrowings, net |  |  | 0
Common stock dividend payments |  |  | 0
Other | (6) | (7) | (6)
Net cash used for financing activities | (271) | 49 | 36
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | (88) | (224) | (223)
Nuclear fuel | 0 | 0 | 0
Proceeds from asset sales |  | 0 | 3
Sales of investment securities held in trusts | 0 | 0 | 0
Purchases of investment securities held in trusts | 0 | 0 | 0
Cash investments | 0 | 0 | 0
Loans to affiliated companies, net | (158) | (376) | (372)
Other |  | 1 | 4
Net cash used for investing activities | (246) | (599) | (588)
Net change in cash and cash equivalents | (1) | 0 | 0
Cash and cash equivalents at beginning of period | 2 | 2 | 2
Cash and cash equivalents at end of period | 1 | 2 | 2
NG |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | 722 | 1,103 | 1,261
New Financing- |  |  |
Long-term debt |  | 285 | 296
Short-term borrowings, net | 0 | 0 | 0
Redemptions and Repayments- |  |  |
Long-term debt | (5) | (308) | (348)
Short-term borrowings, net |  |  | (28)
Common stock dividend payments |  |  | 0
Other | 0 | (2) | (1)
Net cash used for financing activities | (5) | (25) | (81)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | (185) | (292) | (399)
Nuclear fuel | (254) | (232) | (190)
Proceeds from asset sales |  | 0 | 0
Sales of investment securities held in trusts | 940 | 717 | 733
Purchases of investment securities held in trusts | (999) | (783) | (791)
Cash investments | 0 | 0 | 0
Loans to affiliated companies, net | (219) | (488) | (533)
Other |  | 0 | 0
Net cash used for investing activities | (717) | (1,078) | (1,180)
Net change in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0
Consolidated |  |  |
Consolidated Statements of Cash Flows [Abstract] |  |  |
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES | 727 | 786 | 1,152
New Financing- |  |  |
Long-term debt | 0 | 471 | 341
Short-term borrowings, net | 4 | 101 | 0
Redemptions and Repayments- |  |  |
Long-term debt | (163) | (507) | (411)
Short-term borrowings, net | 0 | 0 | (126)
Common stock dividend payments | 0 | 0 | (70)
Other | (7) | (9) | (7)
Net cash used for financing activities | (166) | 56 | (273)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions | (275) | (546) | (627)
Nuclear fuel | (254) | (232) | (190)
Proceeds from asset sales | 0 | 9 | 13
Sales of investment securities held in trusts | 940 | 717 | 733
Purchases of investment securities held in trusts | (999) | (783) | (791)
Cash investments | (3) | 10 | (10)
Loans to affiliated companies, net | 29 | (18) | (11)
Other | 0 | 1 | 4
Net cash used for investing activities | (562) | (842) | (879)
Net change in cash and cash equivalents | (1) | 0 | 0
Cash and cash equivalents at beginning of period | 2 | 2 | 2
Cash and cash equivalents at end of period | $ 1 | $ 2 | $ 2

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