Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	$ (28)	$ 108	$ 23
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	10	(55)	(17)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(18)	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	8	135	75
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(6)	(66)	(39)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(2)	(69)	(36)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	2	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	(56)	(18)	(64)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	24	7	27
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(32)	(11)	(37)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(32)	(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	20	(9)	12
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	(8)	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	12	(5)	7
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	12	(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	20	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	(8)	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	12	(5)	8
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	12	10	11
Amortization of Prior Service (Cost) Credit, Tax	(3)	(4)	(4)
Amortization of Prior Service (Cost) Credit, After-Tax	9	6	7
Amortization of Actuarial Loss, Pre-Tax	(68)	(28)	(75)
Amortization of Actuarial Loss, Tax	(27)	(11)	(31)
Amortization of Actuarial Loss, After-Tax	(41)	(17)	(44)
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	100	181	116
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(52)	(89)	(59)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	48	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	(39)	(26)	(29)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	20	13	14
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(19)	(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	(53)	(20)	(12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	26	10	6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	27	10	6
Power [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	(22)	109	32
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	7	(54)	(21)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(15)	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	7	134	74
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(6)	(65)	(38)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(1)	(69)	(36)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	1	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	(49)	(16)	(55)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	21	7	22
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(28)	(9)	(33)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(28)	(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	20	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	(8)	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	12	(5)	8
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	12	(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	20	(9)	13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	(8)	4	(5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	12	(5)	8
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	11	9	9
Amortization of Prior Service (Cost) Credit, Tax	(3)	(4)	(4)
Amortization of Prior Service (Cost) Credit, After-Tax	8	5	5
Amortization of Actuarial Loss, Pre-Tax	(60)	(25)	(64)
Amortization of Actuarial Loss, Tax	(24)	(11)	(26)
Amortization of Actuarial Loss, After-Tax	(36)	(14)	(38)
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	98	178	112
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(51)	(87)	(57)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	47	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	(38)	(24)	(26)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	19	12	13
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(19)	(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	(53)	(20)	(12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	26	10	6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	$ 27	$ 10	$ 6

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