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Accumulated Other Comprehensive Income (Loss), Net of Tax (Changes of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (270) | $ (283) | $ (87) | $ (283) | $ (95)
Other Comprehensive Income before Reclassifications | (14) |  | 24 | 3 | 30
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 7 |  | (10) | 3 | (8)
Other Comprehensive Income (Loss), net of tax | (7) |  | 14 | 6 | 22
Accumulated Other Comprehensive Income (Loss), Ending Balance | (277) | (270) | (73) | (277) | (73)
Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 1 | 10 | 0 | 10 | (2)
Other Comprehensive Income before Reclassifications | 0 | 1 | 1 | 1 | (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | (10) | 0 | (10) | 7
Other Comprehensive Income (Loss), net of tax | 0 |  | 1 | (9) | 3
Accumulated Other Comprehensive Income (Loss), Ending Balance | 1 | 1 | 1 | 1 | 1
Pension and OPEB Plans [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (403) | (411) | (234) | (411) | (238)
Other Comprehensive Income before Reclassifications | 0 |  | 0 | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 8 |  | 2 | 16 | 6
Other Comprehensive Income (Loss), net of tax | 8 |  | 2 | 16 | 6
Accumulated Other Comprehensive Income (Loss), Ending Balance | (395) | (403) | (232) | (395) | (232)
Available-for-Sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 132 | 118 | 147 | 118 | 145
Other Comprehensive Income before Reclassifications | (14) |  | 23 | 2 | 34
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) |  | (12) | (3) | (21)
Other Comprehensive Income (Loss), net of tax | (15) |  | 11 | (1) | 13
Accumulated Other Comprehensive Income (Loss), Ending Balance | 117 | 132 | 158 | 117 | 158
Power [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (216) | (228) | (57) | (228) | (63)
Other Comprehensive Income before Reclassifications | (14) |  | 23 | 3 | 27
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 7 |  | (10) | 2 | (8)
Other Comprehensive Income (Loss), net of tax | (7) |  | 13 | 5 | 19
Accumulated Other Comprehensive Income (Loss), Ending Balance | (223) | (216) | (44) | (223) | (44)
Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 2 | 11 | 0 | 11 | (1)
Other Comprehensive Income before Reclassifications | 0 |  | 2 | 1 | (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 |  | 0 | (10) | 7
Other Comprehensive Income (Loss), net of tax | 0 |  | 2 | (9) | 3
Accumulated Other Comprehensive Income (Loss), Ending Balance | 2 | 2 | 2 | 2 | 2
Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (344) | (351) | (201) | (351) | (204)
Other Comprehensive Income before Reclassifications | 0 |  | 0 | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 7 |  | 2 | 14 | 5
Other Comprehensive Income (Loss), net of tax | 7 |  | 2 | 14 | 5
Accumulated Other Comprehensive Income (Loss), Ending Balance | (337) | (344) | (199) | (337) | (199)
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 126 | 112 | 144 | 112 | 142
Other Comprehensive Income before Reclassifications | (14) |  | 21 | 2 | 31
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 |  | (12) | (2) | (20)
Other Comprehensive Income (Loss), net of tax | (14) |  | 9 | 0 | 11
Accumulated Other Comprehensive Income (Loss), Ending Balance | $ 112 | $ 126 | $ 153 | $ 112 | $ 153

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