Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and equivalents	$ 149	$ 155	$ 294	$ 302
Accounts receivable, net	394	511
Inventories	35	33
Royalty advances expected to be recouped within one year	103	93
Deferred tax assets	43	43
Prepaid and other current assets	84	59
Total current assets	808	894
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries
Royalty advances expected to be recouped after one year	191	173
Property, plant and equipment, net	187	180
Goodwill	1,679	1,668
Intangible assets subject to amortization, net	3,031	3,107
Intangible assets not subject to amortization	120	120
Other assets	114	110
Total assets	6,130	6,252
Current liabilities:
Accounts payable	210	280
Accrued royalties	1,140	1,147
Accrued liabilities	272	321
Accrued interest	75	75
Deferred revenue	263	139
Current portion of long-term debt	13	13
Other current liabilities	10	25
Total current liabilities	1,983	2,000
Long-term debt	2,856	2,854
Deferred tax liabilities, net	416	439
Other noncurrent liabilities	234	216
Total liabilities	5,489	5,509
Total Warner Music Group Corp. equity (deficit)	623	726
Noncontrolling interest	18	17
Total equity (deficit)	641	743
Total liabilities and equity (deficit)	6,130	6,252
Eliminations
Current assets:
Cash and equivalents
Accounts receivable, net
Inventories
Royalty advances expected to be recouped within one year
Deferred tax assets
Prepaid and other current assets
Total current assets
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries	(3,671)	(3,741)
Royalty advances expected to be recouped after one year
Property, plant and equipment, net
Goodwill
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Other assets
Total assets	(3,671)	(3,741)
Current liabilities:
Accounts payable
Accrued royalties
Accrued liabilities
Accrued interest
Deferred revenue
Current portion of long-term debt
Other current liabilities		6
Total current liabilities		6
Long-term debt
Deferred tax liabilities, net
Other noncurrent liabilities		(7)
Total liabilities		(1)
Total Warner Music Group Corp. equity (deficit)	(3,671)	(3,740)
Noncontrolling interest
Total equity (deficit)	(3,671)	(3,740)
Total liabilities and equity (deficit)	(3,671)	(3,741)
Eliminations
Current assets:
Cash and equivalents
Accounts receivable, net
Inventories
Royalty advances expected to be recouped within one year
Deferred tax assets
Prepaid and other current assets
Total current assets
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries	(1,400)	(1,605)
Royalty advances expected to be recouped after one year
Property, plant and equipment, net
Goodwill
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Other assets
Total assets	(1,400)	(1,605)
Current liabilities:
Accounts payable
Accrued royalties
Accrued liabilities
Accrued interest
Deferred revenue
Current portion of long-term debt
Other current liabilities
Total current liabilities
Long-term debt
Deferred tax liabilities, net
Other noncurrent liabilities
Total liabilities
Total Warner Music Group Corp. equity (deficit)	(1,400)	(1,605)
Noncontrolling interest
Total equity (deficit)	(1,400)	(1,605)
Total liabilities and equity (deficit)	(1,400)	(1,605)
WMG Acquisition Corp. (issuer)
Current assets:
Cash and equivalents			44	44
Accounts receivable, net
Inventories
Royalty advances expected to be recouped within one year
Deferred tax assets
Prepaid and other current assets	5	5
Total current assets	5	5
Due (to) from parent companies	965	799
Investments in and advances to (from) consolidated subsidiaries	2,544	2,811
Royalty advances expected to be recouped after one year
Property, plant and equipment, net
Goodwill
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Other assets	63	68
Total assets	3,577	3,683
Current liabilities:
Accounts payable
Accrued royalties
Accrued liabilities
Accrued interest	65	65
Deferred revenue
Current portion of long-term debt	13	13
Other current liabilities
Total current liabilities	78	78
Long-term debt	2,706	2,704
Deferred tax liabilities, net
Other noncurrent liabilities	16	22
Total liabilities	2,800	2,804
Total Warner Music Group Corp. equity (deficit)	777	879
Noncontrolling interest
Total equity (deficit)	777	879
Total liabilities and equity (deficit)	3,577	3,683
Guarantor Subsidiaries
Current assets:
Cash and equivalents	27	16	94	105
Accounts receivable, net	143	185
Inventories	9	10
Royalty advances expected to be recouped within one year	60	59
Deferred tax assets	21	21
Prepaid and other current assets	7	8
Total current assets	267	299
Due (to) from parent companies	(48)	(27)
Investments in and advances to (from) consolidated subsidiaries	1,127	930
Royalty advances expected to be recouped after one year	111	109
Property, plant and equipment, net	107	101
Goodwill	1,379	1,379
Intangible assets subject to amortization, net	964	1,007
Intangible assets not subject to amortization	75	75
Other assets	21	14
Total assets	4,003	3,887
Current liabilities:
Accounts payable	82	96
Accrued royalties	532	570
Accrued liabilities	76	94
Accrued interest
Deferred revenue	171	56
Current portion of long-term debt
Other current liabilities		23
Total current liabilities	861	839
Long-term debt
Deferred tax liabilities, net	126	128
Other noncurrent liabilities	82	68
Total liabilities	1,069	1,035
Total Warner Music Group Corp. equity (deficit)	2,934	2,852
Noncontrolling interest
Total equity (deficit)	2,934	2,852
Total liabilities and equity (deficit)	4,003	3,887
Non-Guarantor Subsidiaries
Current assets:
Cash and equivalents	122	139	146	143
Accounts receivable, net	251	326
Inventories	26	23
Royalty advances expected to be recouped within one year	43	34
Deferred tax assets	22	22
Prepaid and other current assets	72	46
Total current assets	536	590
Due (to) from parent companies	(917)	(772)
Investments in and advances to (from) consolidated subsidiaries
Royalty advances expected to be recouped after one year	80	64
Property, plant and equipment, net	80	79
Goodwill	300	289
Intangible assets subject to amortization, net	2,067	2,100
Intangible assets not subject to amortization	45	45
Other assets	24	21
Total assets	2,215	2,416
Current liabilities:
Accounts payable	128	184
Accrued royalties	608	577
Accrued liabilities	196	227
Accrued interest
Deferred revenue	92	83
Current portion of long-term debt
Other current liabilities	10	(4)
Total current liabilities	1,034	1,067
Long-term debt
Deferred tax liabilities, net	290	311
Other noncurrent liabilities	136	133
Total liabilities	1,460	1,511
Total Warner Music Group Corp. equity (deficit)	737	888
Noncontrolling interest	18	17
Total equity (deficit)	755	905
Total liabilities and equity (deficit)	2,215	2,416
WMG Acquisition Corp. Consolidated
Current assets:
Cash and equivalents	149	155	284	292
Accounts receivable, net	394	511
Inventories	35	33
Royalty advances expected to be recouped within one year	103	93
Deferred tax assets	43	43
Prepaid and other current assets	84	59
Total current assets	808	894
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries
Royalty advances expected to be recouped after one year	191	173
Property, plant and equipment, net	187	180
Goodwill	1,679	1,668
Intangible assets subject to amortization, net	3,031	3,107
Intangible assets not subject to amortization	120	120
Other assets	108	103
Total assets	6,124	6,245
Current liabilities:
Accounts payable	210	280
Accrued royalties	1,140	1,147
Accrued liabilities	272	321
Accrued interest	65	65
Deferred revenue	263	139
Current portion of long-term debt	13	13
Other current liabilities	10	25
Total current liabilities	1,973	1,990
Long-term debt	2,706	2,704
Deferred tax liabilities, net	416	439
Other noncurrent liabilities	234	216
Total liabilities	5,329	5,349
Total Warner Music Group Corp. equity (deficit)	777	879
Noncontrolling interest	18	17
Total equity (deficit)	795	896
Total liabilities and equity (deficit)	6,124	6,245
WMG Holdings Corp. (issuer)
Current assets:
Cash and equivalents			10	10
Accounts receivable, net
Inventories
Royalty advances expected to be recouped within one year
Deferred tax assets
Prepaid and other current assets
Total current assets
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries	777	879
Royalty advances expected to be recouped after one year
Property, plant and equipment, net
Goodwill
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Other assets	6	7
Total assets	783	886
Current liabilities:
Accounts payable
Accrued royalties
Accrued liabilities
Accrued interest	10	10
Deferred revenue
Current portion of long-term debt
Other current liabilities
Total current liabilities	10	10
Long-term debt	150	150
Deferred tax liabilities, net
Other noncurrent liabilities
Total liabilities	160	160
Total Warner Music Group Corp. equity (deficit)	623	726
Noncontrolling interest
Total equity (deficit)	623	726
Total liabilities and equity (deficit)	783	886
Warner Music Group Corp.
Current assets:
Cash and equivalents
Accounts receivable, net
Inventories
Royalty advances expected to be recouped within one year
Deferred tax assets
Prepaid and other current assets
Total current assets
Due (to) from parent companies
Investments in and advances to (from) consolidated subsidiaries	623	726
Royalty advances expected to be recouped after one year
Property, plant and equipment, net
Goodwill
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Other assets
Total assets	623	726
Current liabilities:
Accounts payable
Accrued royalties
Accrued liabilities
Accrued interest
Deferred revenue
Current portion of long-term debt
Other current liabilities
Total current liabilities
Long-term debt
Deferred tax liabilities, net
Other noncurrent liabilities
Total liabilities
Total Warner Music Group Corp. equity (deficit)	623	726
Noncontrolling interest
Total equity (deficit)	623	726
Total liabilities and equity (deficit)	$ 623	$ 726