Fair Value of Assets and Liabilities (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	$ 1,469	$ 2,186
Total gains (losses) included in: net income	(4)	18
Total gains (losses) included in: OCI	(4)	(8)
Transfers into Level 3	17	9
Transfers out of Level 3	(73)	(84)
Transfer from held for sale		0
Purchases	88
Purchases/Issues	0	98
Sales	(79)	(227)
Settlements	(30)	(35)
Balance at end of period	1,384	1,957
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Balance at the beginning of the period	(323)	(553)
Total gains (losses) included in: net income	(4)	15
Total gains (losses) included in: OCI	0
Transfers into Level 3	0
Transfers out of Level 3	0
Purchases	0
Settlements	2	4
Sales	0
Transfer from held for sale		0
Purchases/ Issues		(15)
Sales	(1)	0
Balance at the end of the period	(326)	(549)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities	(8)	33
Other investments: Free-standing derivatives	2	5
Free-standing derivatives, liabilities	9	12
Assets transferred between Level 1 and Level 2	0	0
Liabilities transferred between Level 1 and Level 2	0	0
Realized capital gains and losses
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Total gains (losses) included in: net income	6	(20)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(2)	(2)
Net investment income
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Total gains (losses) included in: net income	(2)	(2)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	2	2
Interest credited to contractholder funds
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Total gains (losses) included in: net income	4	(10)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(4)	10
Life and annuity contract benefits
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		5
Discontinued Operations [Member]
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(4)
Loss on disposition of operations
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Total gains (losses) included in: net income	(2)
Fixed income securities
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	1,387	1,697
Total gains (losses) included in: net income	(4)	1
Total gains (losses) included in: OCI	(6)	5
Transfers into Level 3	17	5
Transfers out of Level 3	(73)	(82)
Transfer from held for sale		4
Purchases	75
Purchases/Issues	0	65
Sales	(79)	(98)
Settlements	(30)	(27)
Balance at end of period	1,287	1,570
U.S. government and agencies
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	6	7
Total gains (losses) included in: net income	0	0
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	0
Purchases/Issues	0	0
Sales	0	0
Settlements	(1)	(1)
Balance at end of period	5	6
Municipal
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	270	343
Total gains (losses) included in: net income	0	(4)
Total gains (losses) included in: OCI	2	5
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	0
Purchases/Issues	0	1
Sales	(33)	(9)
Settlements	(1)	(1)
Balance at end of period	238	335
Corporate
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	891	1,109
Total gains (losses) included in: net income	(3)	5
Total gains (losses) included in: OCI	(8)	1
Transfers into Level 3	5	0
Transfers out of Level 3	0	(25)
Transfer from held for sale		0
Purchases	60
Purchases/Issues	0	16
Sales	(46)	(87)
Settlements	(21)	(20)
Balance at end of period	878	999
Asset-backed securities (“ABS”)
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	196	192
Total gains (losses) included in: net income	(1)	0
Total gains (losses) included in: OCI	0	(1)
Transfers into Level 3	12	0
Transfers out of Level 3	(73)	(57)
Transfer from held for sale		0
Purchases	10
Purchases/Issues	0	44
Sales	0	0
Settlements	(7)	(4)
Balance at end of period	137	174
Residential mortgage-backed securities (“RMBS”)
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	1	2
Total gains (losses) included in: net income	0	0
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	0
Purchases/Issues	0	0
Sales	0	0
Settlements	0	0
Balance at end of period	1	2
Commercial mortgage-backed securities (“CMBS”)
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	23	43
Total gains (losses) included in: net income	0	0
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	5
Transfers out of Level 3	0	0
Transfer from held for sale		4
Purchases	5
Purchases/Issues	0	4
Sales	0	(1)
Settlements	0	(1)
Balance at end of period	28	54
Redeemable preferred stock
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period		1
Total gains (losses) included in: net income		0
Total gains (losses) included in: OCI		0
Transfers into Level 3		0
Transfers out of Level 3		0
Transfer from held for sale		0
Purchases/Issues		0
Sales		(1)
Settlements		0
Balance at end of period		0
Equity securities
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	83	132
Total gains (losses) included in: net income	0	20
Total gains (losses) included in: OCI	2	(15)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	8
Purchases/Issues	0	1
Sales	0	(121)
Settlements	0	0
Balance at end of period	93	17
Short-term investments
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	5	0
Total gains (losses) included in: net income	0	0
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	5
Purchases/Issues	0	30
Sales	0	0
Settlements	0	0
Balance at end of period	10	30
Free-standing derivatives, net
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	(7)	(5)
Total gains (losses) included in: net income	0	(2)
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	0
Purchases/Issues	0	2
Sales	0	0
Settlements	0	(2)
Balance at end of period	(7)	(7)
Other assets
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	1	0
Total gains (losses) included in: net income	0	0
Total gains (losses) included in: OCI	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Transfer from held for sale		0
Purchases	0
Purchases/Issues	0	0
Sales	0	0
Settlements	0	0
Balance at end of period	1	0
Assets held for sale
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period		362
Total gains (losses) included in: net income		(1)
Total gains (losses) included in: OCI		2
Transfers into Level 3		4
Transfers out of Level 3		(2)
Transfer from held for sale		(4)
Purchases/Issues		0
Sales		(8)
Settlements		(6)
Balance at end of period		347
Liabilities held for sale
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Balance at the beginning of the period		(246)
Total gains (losses) included in: net income	0	17
Total gains (losses) included in: OCI	0
Transfers into Level 3	0
Transfers out of Level 3	0
Settlements		3
Transfer from held for sale		0
Purchases/ Issues		(4)
Sales		0
Balance at the end of the period		(230)
Derivatives embedded in life and annuity contracts
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Embedded Derivative, Fair Value of Embedded Derivative Liability			323
Balance at the beginning of the period		(307)
Total gains (losses) included in: net income	(4)	(2)
Total gains (losses) included in: OCI	0
Transfers into Level 3	0
Transfers out of Level 3	0
Purchases	0
Settlements	2	1
Sales	0
Transfer from held for sale		0
Purchases/ Issues		(11)
Sales	(1)	0
Balance at the end of the period	(326)	(319)
Significant unobservable inputs (Level 3) \| Recurring
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Other assets	1		1
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Other investments: Free-standing derivatives	2		2
Free-standing derivatives, liabilities	9		9
Significant unobservable inputs (Level 3) \| Recurring \| Derivatives embedded in life and annuity contracts
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 326		$ 323

Amount of transfer of assets measured on a recurring basis between Level 1 and Level 2 of the fair value hierarchy.

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Amount of transfer of liabilities measured on a recurring basis between Level 1 and Level 2 of the fair value hierarchy.

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Represents the amount of transfers of financial instrument classified as a liability to held for sale.

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Represents the amount of transfer of financial instrument classified as an asset to held for sale.

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Represents the fair values as of the balance sheet date of all assets resulting from free-standing derivative contracts.

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Represents the fair values as of the balance sheet date of all liabilities resulting from free-standing derivative contracts.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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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.

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Amount of gain (loss) recognized in other comprehensive income (loss) 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.

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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.

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Amount of purchases, (sales), issuances and (settlements) 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.

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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.

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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.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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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.

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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.

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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.

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Amount of issuances 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.

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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.

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