Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Revenues	$ 2,318		$ 2,554		$ 2,310		$ 2,786		$ 2,406		$ 2,402		$ 2,098		$ 2,875		$ 9,968	$ 9,781	$ 11,079
Operating Expenses																	7,669	7,503	8,337
Operating Income (Loss)	365		712		612		610		468		594		433		783		2,299	2,278	2,742
Equity Earnings (Losses) of Subsidiaries																	11	12	4
Other Income																	213	260	220
Other Deductions																	(54)	(98)	(85)
Other-Than-Temporary Impairments																	(12)	(18)	(22)
Interest Expense																	(402)	(423)	(475)
Income Tax Benefit (Expense)																	(812)	(736)	(977)
Income (Loss) on Discontinued Operations, net of tax																	0	0	(96)
Net Income																	1,243	1,275	1,503
Net Cash Provided By (Used In) Operating Activities																	3,158	2,787	3,557
Net Cash Provided By (Used In) Investing Activities																	(2,801)	(2,625)	(1,269)
Net Cash Provided By (Used In) Financing Activities																	(243)	(617)	(1,734)
Current Assets	3,614								3,869								3,614	3,869
Property, Plant and Equipment, net	21,645								19,736								21,645	19,736
Noncurrent Assets	7,263								8,120								7,263	8,120
Total Assets	32,522								31,725								32,522	31,725
Current Liabilities	3,063								3,777								3,063	3,777
Noncurrent Liabilities	9,988								10,480								9,988	10,480
Total Long-Term Debt	7,862								6,687								7,862	6,687
Member's Equity	11,609								10,781								11,609	10,781	10,272	9,641
TOTAL LIABILITIES AND CAPITALIZATION	32,522								31,725								32,522	31,725
Power [Member]
Operating Revenues	1,245	[1]	1,174	[1]	1,193	[1]	1,451	[1]	1,282	[1]	1,041	[1]	987	[1]	1,563	[1]	5,063	4,873	6,150
Operating Expenses																	3,993	3,750	4,377
Operating Income (Loss)	107	[1]	370	[1]	351	[1]	242	[1]	216	[1]	268	[1]	198	[1]	441	[1]	1,070	1,123	1,773
Equity Earnings (Losses) of Subsidiaries																	16	15	14
Other Income																	154	201	190
Other Deductions																	(49)	(90)	(79)
Other-Than-Temporary Impairments																	(12)	(18)	(20)
Interest Expense																	(116)	(132)	(175)
Income Tax Benefit (Expense)																	(419)	(433)	(690)
Income (Loss) on Discontinued Operations, net of tax																	0	0	(96)
Net Income																	644	666	1,109
Net Cash Provided By (Used In) Operating Activities																	1,347	1,453	1,817
Net Cash Provided By (Used In) Investing Activities																	(861)	(472)	(578)
Net Cash Provided By (Used In) Financing Activities																	(487)	(986)	(1,238)
Current Assets	2,476								2,236								2,476	2,236
Property, Plant and Equipment, net	7,367								7,222								7,367	7,222
Noncurrent Assets	2,159								1,865								2,159	1,865
Total Assets	12,002								11,323								12,002	11,323
Current Liabilities	800								968								800	968
Noncurrent Liabilities	2,847								2,685								2,847	2,685
Total Long-Term Debt	2,497								2,040								2,497	2,040
Member's Equity	5,858								5,630								5,858	5,630	5,566	5,143
TOTAL LIABILITIES AND CAPITALIZATION	12,002								11,323								12,002	11,323
Power Senior Notes [Member]
Operating Revenues																	5,063	4,873	6,150
Operating Expenses																	3,993	3,750	4,377
Operating Income (Loss)																	1,070	1,123	1,773
Equity Earnings (Losses) of Subsidiaries																	16	15	14
Other Income																	154	201	190
Other Deductions																	(49)	(90)	(79)
Other-Than-Temporary Impairments																	(12)	(18)	(20)
Interest Expense																	(116)	(132)	(175)
Income Tax Benefit (Expense)																	(419)	(433)	(690)
Income (Loss) on Discontinued Operations, net of tax																			(96)
Net Income																	644	666	1,109
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	909	614	928
Net Cash Provided By (Used In) Operating Activities																	1,347	1,453	1,817
Net Cash Provided By (Used In) Investing Activities																	(861)	(472)	(578)
Net Cash Provided By (Used In) Financing Activities																	(487)	(986)	(1,238)
Current Assets	2,476								2,236								2,476	2,236
Property, Plant and Equipment, net	7,367								7,222								7,367	7,222
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0								0								0	0
Noncurrent Assets	2,159								1,865								2,159	1,865
Total Assets	12,002								11,323								12,002	11,323
Current Liabilities	800								968								800	968
Noncurrent Liabilities	2,847								2,685								2,847	2,685
Total Long-Term Debt	2,497								2,040								2,497	2,040
Member's Equity	5,858								5,630								5,858	5,630
TOTAL LIABILITIES AND CAPITALIZATION	12,002								11,323								12,002	11,323
Power Senior Notes [Member] | Guarantor Subsidiaries [Member]
Operating Revenues																	6,490	6,238	7,452
Operating Expenses																	5,413	5,118	5,673
Operating Income (Loss)																	1,077	1,120	1,779
Equity Earnings (Losses) of Subsidiaries																	(5)	(10)	92
Other Income																	157	206	195
Other Deductions																	(35)	(59)	(51)
Other-Than-Temporary Impairments																	(12)	(18)	(19)
Interest Expense																	(42)	(51)	(56)
Income Tax Benefit (Expense)																	(474)	(501)	(762)
Income (Loss) on Discontinued Operations, net of tax																			0
Net Income																	666	687	1,178
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	713	681	1,055
Net Cash Provided By (Used In) Operating Activities																	1,503	1,562	2,427
Net Cash Provided By (Used In) Investing Activities																	(1,092)	(1,206)	(1,171)
Net Cash Provided By (Used In) Financing Activities																	(412)	(361)	(1,256)
Current Assets	8,916								8,084								8,916	8,084
Property, Plant and Equipment, net	6,108								5,988								6,108	5,988
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	729								733								729	733
Noncurrent Assets	1,847								1,660								1,847	1,660
Total Assets	17,600								16,465								17,600	16,465
Current Liabilities	10,919								10,187								10,919	10,187
Noncurrent Liabilities	2,247								1,960								2,247	1,960
Total Long-Term Debt	0								0								0	0
Member's Equity	4,434								4,318								4,434	4,318
TOTAL LIABILITIES AND CAPITALIZATION	17,600								16,465								17,600	16,465
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member]
Operating Revenues																	190	135	155
Operating Expenses																	174	125	157
Operating Income (Loss)																	16	10	(2)
Equity Earnings (Losses) of Subsidiaries																	16	15	14
Other Income																	0	2	0
Other Deductions																	0	0	0
Other-Than-Temporary Impairments																	0	0	0
Interest Expense																	(19)	(16)	(18)
Income Tax Benefit (Expense)																	0	(2)	9
Income (Loss) on Discontinued Operations, net of tax																			(97)
Net Income																	13	9	100
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	11	9	100
Net Cash Provided By (Used In) Operating Activities																	82	67	(279)
Net Cash Provided By (Used In) Investing Activities																	(71)	(151)	594
Net Cash Provided By (Used In) Financing Activities																	(11)	83	(314)
Current Assets	944								942								944	942
Property, Plant and Equipment, net	1,178								1,154								1,178	1,154
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0								0								0	0
Noncurrent Assets	138								145								138	145
Total Assets	2,260								2,241								2,260	2,241
Current Liabilities	982								1,011								982	1,011
Noncurrent Liabilities	338								306								338	306
Total Long-Term Debt	0								0								0	0
Member's Equity	940								924								940	924
TOTAL LIABILITIES AND CAPITALIZATION	2,260								2,241								2,260	2,241
Power Senior Notes [Member] | Consolidation, Eliminations [Member]
Operating Revenues																	(1,617)	(1,500)	(1,457)
Operating Expenses																	(1,617)	(1,500)	(1,458)
Operating Income (Loss)																	0	0	1
Equity Earnings (Losses) of Subsidiaries																	(679)	(697)	(1,278)
Other Income																	(38)	(52)	(45)
Other Deductions																	0	0	0
Other-Than-Temporary Impairments																	0	0	0
Interest Expense																	38	53	45
Income Tax Benefit (Expense)																	0	0	0
Income (Loss) on Discontinued Operations, net of tax																		696	1
Net Income																	(679)		(1,278)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	(724)	(690)	(1,155)
Net Cash Provided By (Used In) Operating Activities																	(526)	(474)	(940)
Net Cash Provided By (Used In) Investing Activities																	109	170	(597)
Net Cash Provided By (Used In) Financing Activities																	417	255	1,542
Current Assets	(11,544)								(10,712)								(11,544)	(10,712)
Property, Plant and Equipment, net	0								0								0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(5,374)								(5,241)								(5,374)	(5,241)
Noncurrent Assets	(48)								(141)								(48)	(141)
Total Assets	(16,966)								(16,094)								(16,966)	(16,094)
Current Liabilities	(11,545)								(10,712)								(11,545)	(10,712)
Noncurrent Liabilities	(47)								(140)								(47)	(140)
Total Long-Term Debt	0								0								0	0
Member's Equity	(5,374)								(5,242)								(5,374)	(5,242)
TOTAL LIABILITIES AND CAPITALIZATION	(16,966)								(16,094)								(16,966)	(16,094)
Power Senior Notes [Member] | Power Parent [Member]
Operating Revenues																	0	0	0
Operating Expenses																	23	7	5
Operating Income (Loss)																	(23)	(7)	(5)
Equity Earnings (Losses) of Subsidiaries																	684	707	1,186
Other Income																	35	45	40
Other Deductions																	(14)	(31)	(28)
Other-Than-Temporary Impairments																	0	0	(1)
Interest Expense																	(93)	(118)	(146)
Income Tax Benefit (Expense)																	55	70	63
Income (Loss) on Discontinued Operations, net of tax																			0
Net Income																	644	666	1,109
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	909	614	928
Net Cash Provided By (Used In) Operating Activities																	288	298	609
Net Cash Provided By (Used In) Investing Activities																	193	715	596
Net Cash Provided By (Used In) Financing Activities																	(481)	(963)	(1,210)
Current Assets	4,160								3,922								4,160	3,922
Property, Plant and Equipment, net	81								80								81	80
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	4,645								4,508								4,645	4,508
Noncurrent Assets	222								201								222	201
Total Assets	9,108								8,711								9,108	8,711
Current Liabilities	444								482								444	482
Noncurrent Liabilities	309								559								309	559
Total Long-Term Debt	2,497								2,040								2,497	2,040
Member's Equity	5,858								5,630								5,858	5,630
TOTAL LIABILITIES AND CAPITALIZATION	$ 9,108								$ 8,711								$ 9,108	$ 8,711

[1] Power's information has been restated for all periods presented to reflect the transfer of certain of Energy Holdings' equity investments to Power on December 31, 2013. For additional information see Note 1. Organization, Basis of Presentation and Summary of Significant Accounting Policies.