Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	$ 108	$ 23
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	(55)	(17)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	53	6
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	135	75
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(66)	(39)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	69	36
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	69	36
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(18)	(64)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	7	27
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(11)	(37)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(11)	(37)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(9)	12
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(5)	7
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(5)	7
Operating Revenues [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(5)	8
Operation and Maintenance Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, After-Tax	6	7
Amortization of Actuarial Loss, After-Tax	(17)	(44)
Operation and Maintenance Expense [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	(10)	11
Amortization of Prior Service (Cost) Credit, Tax	(4)	(4)
Amortization of Actuarial Loss, Pre-Tax	28	75
Amortization of Actuarial Loss, Tax	(11)	31
Other Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	181	116
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(89)	(59)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(92)	(57)
Interest Expense [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax		(1)
Amount Reclassified from AOCI for Cash Flow Hedges, Tax		0
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax		(1)
Other Deductions [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(26)	(29)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	13	14
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	13	15
Other-Than-Temporary Impairments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(20)	(12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	10	6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(10)	(6)
Power [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Actuarial Loss, After-Tax	(14)	(38)
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	109	32
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	(54)	(21)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	55	11
Power [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	134	74
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(65)	(38)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	69	36
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	69	36
Power [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(16)	(55)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	7	22
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(9)	(33)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(9)	(33)
Power [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(5)	8
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(5)	8
Power [Member] \| Operating Revenues [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(5)	8
Power [Member] \| Operation and Maintenance Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, After-Tax	5	5
Power [Member] \| Operation and Maintenance Expense [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	(9)	(9)
Amortization of Prior Service (Cost) Credit, Tax	(4)	(4)
Amortization of Actuarial Loss, Pre-Tax	(25)	(64)
Amortization of Actuarial Loss, Tax	11	26
Power [Member] \| Other Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	178	112
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(87)	(57)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(91)	(55)
Power [Member] \| Other Deductions [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(24)	(26)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	12	13
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	12	13
Power [Member] \| Other-Than-Temporary Impairments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(20)	(12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	10	6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	$ (10)	$ (6)

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