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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Jul. 01, 2012 | Jul. 01, 2013 | Dec. 30, 2012 | Jul. 31, 2012 | Jan. 01, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2013 |  |  |  |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  |  |  |  |  |  |  |  |  | $ 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 206,000,000 |  | 546,500,000 |  |  |  | 419,000,000 | 1,011,800,000 | 684,100,000
Total Gains (Losses) Included in Earnings |  |  | (300,000) |  | 41,100,000 |  | 100,000 |  |  |  |
Total Gains (Losses) Included in AOCI | (10,800,000) |  | (9,600,000) |  | 1,200,000 |  | (2,500,000) |  |  |  |
Purchases | 106,300,000 |  | 394,700,000 |  | 496,700,000 |  | 352,800,000 |  |  |  |
Sales |  |  | (9,600,000) |  | (24,900,000) |  | (8,200,000) |  |  |  |
Settlements | (11,800,000) |  | (25,500,000) |  | (77,400,000) |  | (44,800,000) |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] | (53,000,000) | [1] | 28,600,000 | [2] | 30,300,000 | [2] |  |  |
Balance at End of Period | 502,700,000 |  | 502,700,000 |  |  |  |  |  | 419,000,000 | 1,011,800,000 | 684,100,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 1,782,800,000 |  | 1,472,100,000 |  |  |  | 1,842,300,000 | 1,685,800,000 | 1,571,000,000
Total Gains (Losses) Included in Earnings | (106,300,000) |  | (46,800,000) |  | 213,700,000 |  | 114,800,000 |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements | (2,800,000) |  | (2,800,000) |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [1] |  | [2] |  | [2] |  |  |
Balance at End of Period | 1,733,200,000 |  | 1,733,200,000 |  |  |  |  |  | 1,842,300,000 | 1,685,800,000 | 1,571,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  | 0 |  | 30,900,000 | [2] |  |  |  |  |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 1,550,800,000 |  | 1,396,300,000 |  |  |  | 1,639,600,000 | 1,486,400,000 | 1,496,700,000
Total Gains (Losses) Included in Earnings | (53,700,000) |  | 35,100,000 |  | 90,100,000 |  | (10,300,000) |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [1] |  | [2] |  | [2] |  |  |
Balance at End of Period | 1,585,900,000 |  | 1,585,900,000 |  |  |  |  |  | 1,639,600,000 | 1,486,400,000 | 1,496,700,000
Equity conversion feature of preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 232,000,000 |  | 75,400,000 |  |  |  | 202,700,000 | 199,400,000 | 73,900,000
Total Gains (Losses) Included in Earnings | (52,600,000) |  | (81,900,000) |  | 124,000,000 |  | 125,500,000 |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements | (2,800,000) |  | (2,800,000) |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [1] |  | [2] |  | [2] |  |  |
Balance at End of Period | 147,300,000 |  | 147,300,000 |  |  |  |  |  | 202,700,000 | 199,400,000 | 73,900,000
Available-for-sale embedded derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 400,000 |  |  |  |  |  | 400,000
Total Gains (Losses) Included in Earnings |  |  |  |  | (400,000) |  | (400,000) |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  |  |  |  |  | [2] |  | [2] |  |  |
Balance at End of Period |  |  |  |  |  |  |  |  |  |  | 400,000
US Treasury and Government [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 79,300,000 |  | 79,300,000 |  |  |  |  |  |  |  |
Asset-backed and Hybrid Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  | 53,000,000 |  |  |  |  |  |  |  |
Commercial mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 5,000,000 |  |  |  |  |  | 6,200,000 |  |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI | (300,000) |  | (100,000) |  |  |  |  |  |  |  |
Purchases |  |  | 1,000,000 |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  | 0 |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  | [1] |  |  |  |  |  |  |
Balance at End of Period | 5,900,000 |  | 5,900,000 |  |  |  |  |  | 6,200,000 |  |
Corporates [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 135,300,000 |  | 159,700,000 |  |  |  | 356,500,000 | 205,800,000 | 120,100,000
Total Gains (Losses) Included in Earnings |  |  | (300,000) |  | 200,000 |  | 200,000 |  |  |  |
Total Gains (Losses) Included in AOCI | (12,000,000) |  | (10,800,000) |  | (5,900,000) |  | (3,600,000) |  |  |  |
Purchases | 106,200,000 |  | 383,600,000 |  | 91,600,000 |  | 90,300,000 |  |  |  |
Sales |  |  | (9,600,000) |  | (24,400,000) |  | (7,700,000) |  |  |  |
Settlements | (11,700,000) |  | (25,400,000) |  | (45,300,000) |  | (33,700,000) |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] | (33,800,000) | [1] | 29,900,000 | [2] | 40,200,000 | [2] |  |  |
Balance at End of Period | 439,000,000 |  | 439,000,000 |  |  |  |  |  | 356,500,000 | 205,800,000 | 120,100,000
Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 8,800,000 |  | 5,200,000 |  |  |  |  | 5,200,000 | 5,100,000
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | (100,000) |  |  |  | 100,000 |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  | (8,700,000) | [1] |  | [2] |  | [2] |  |  |
Balance at End of Period |  |  |  |  |  |  |  |  |  | 5,200,000 | 5,100,000
Municipals [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  |  |  |  |  |  | 100,000 | 10,400,000
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  | 100,000 |  |  |  |  |  |
Purchases |  |  |  |  | 10,200,000 |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (10,200,000) | [2] | (10,300,000) | [2] |  |  |
Balance at End of Period |  |  |  |  |  |  |  |  |  | 100,000 | 10,400,000
Agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 3,300,000 |  |  |  |  |  | 3,300,000
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (3,300,000) | [2] | (3,300,000) | [2] |  |  |
Balance at End of Period |  |  |  |  |  |  |  |  |  |  | 3,300,000
Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 3,800,000 |  |  |  |  | 600,000 | 1,200,000
Total Gains (Losses) Included in Earnings |  |  |  |  | (100,000) |  | (100,000) |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  | 100,000 |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  | (500,000) |  | (500,000) |  |  |  |
Settlements |  |  |  |  | (300,000) |  | (100,000) |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (2,300,000) | [2] |  | [2] |  |  |
Balance at End of Period |  |  |  |  |  |  |  |  |  | 600,000 | 1,200,000
Equity securities available-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 0 |  |  |  |  |  | 10,000,000 |  |
Total Gains (Losses) Included in Earnings | 0 |  | 0 |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI | 1,600,000 |  | 1,600,000 |  |  |  |  |  |  |  |
Purchases | 100,000 |  | 10,100,000 |  |  |  |  |  |  |  |
Sales | 0 |  | 0 |  |  |  |  |  |  |  |
Settlements | 0 |  | 0 |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  | 0 |  |  |  |  |  |  |  |
Balance at End of Period | 11,700,000 |  | 11,700,000 |  |  |  |  |  | 10,000,000 |  |
Corporate and Non-Agency Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (13,600,000) |  | (15,800,000) |  |  |  |  |  |  |  |
Contingent purchase price reduction receivable [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 41,000,000 |  |  |  |  |  | 41,000,000 | 41,000,000 | 41,000,000
Total Gains (Losses) Included in Earnings |  |  |  |  | 41,000,000 |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  | [1] |  | [2] |  | [2] |  |  |
Balance at End of Period | 41,000,000 |  | 41,000,000 |  |  |  |  |  | 41,000,000 | 41,000,000 | 41,000,000
Asset-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  | $ 44,400,000 | [2] | $ 43,900,000 | [2] |  |  |
[1] | The net transfers in and out of Level 3 during the three and nine months ended June 30, 2013 were exclusively to or from Level 2.
[2] | The net transfers in and out of Level 3 during the three and nine months ended July 1, 2012 was exclusively to or from Level 2.

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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