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Supplemental Guarantor Information (Details 2) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES $ 785 $ 650  
New Financing-      
Short-term borrowings, net 75 425  
Redemptions and Repayments-      
Long-term debt (211) (31)  
Other (13) (12)  
Net cash (used for) provided from financing activities (58) 230  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Property additions (588) (698)  
Nuclear fuel (132) (149)  
Sales of investment securities held in trusts 738 465  
Purchases of investment securities held in trusts (761) (488)  
Other 16 39  
Net cash used for investing activities (762) (865)  
Net change in cash and cash equivalents (35) 15  
Cash and cash equivalents at beginning of period 199 131 $ 131
Cash and cash equivalents at end of period 164 146 199
Eliminations      
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES 0 0  
New Financing-      
Short-term borrowings, net (88) (312)  
Redemptions and Repayments-      
Long-term debt 0    
Short-term borrowings, net 22 11  
Other 0 0  
Net cash (used for) provided from financing activities (66) (301)  
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 66 301  
Other   0  
Net cash used for investing activities 66 301  
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
FES      
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES (142) (356)  
New Financing-      
Short-term borrowings, net 100 352  
Redemptions and Repayments-      
Long-term debt 0    
Short-term borrowings, net 0 0  
Other (1) 0  
Net cash (used for) provided from financing activities 99 352  
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   10  
Loans to affiliated companies, net 43 12  
Other   9  
Net cash used for investing activities 43 4  
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
FG      
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES 163 278  
New Financing-      
Short-term borrowings, net 0 8  
Redemptions and Repayments-      
Long-term debt (29)    
Short-term borrowings, net (22) (11)  
Other (2) (3)  
Net cash (used for) provided from financing activities (53) (6)  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Property additions (21) (53)  
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 (89) (219)  
Other   0  
Net cash used for investing activities (110) (272)  
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
NG      
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES 200 307  
New Financing-      
Short-term borrowings, net 1 1  
Redemptions and Repayments-      
Long-term debt 0    
Short-term borrowings, net 0 0  
Other 0 0  
Net cash (used for) provided from financing activities 1 1  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Property additions (64) (63)  
Nuclear fuel (132) (149)  
Sales of investment securities held in trusts 231 138  
Purchases of investment securities held in trusts (245) (151)  
Cash investments   0  
Loans to affiliated companies, net 9 (83)  
Other   0  
Net cash used for investing activities (201) (308)  
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
Consolidated      
Consolidated Statements of Cash Flows [Abstract]      
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES 221 229  
New Financing-      
Short-term borrowings, net 13 49  
Redemptions and Repayments-      
Long-term debt (29) 0  
Short-term borrowings, net 0 0  
Other (3) (3)  
Net cash (used for) provided from financing activities (19) 46  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Property additions (85) (143)  
Nuclear fuel (132) (149)  
Sales of investment securities held in trusts 231 138  
Purchases of investment securities held in trusts (245) (151)  
Cash investments 0 10  
Loans to affiliated companies, net 29 11  
Other 0 9  
Net cash used for investing activities (202) (275)  
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