Assets as a percent of total assets measured at fair value on a recurring and non-recurring basis.

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Free Standing Derivative Assets, Derivative Asset, Fair Value, Gross Asset and Right to Reclaim Cash, Offset

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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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Liabilities as a percent of total liabilities measured at fair value on a recurring and non-recurring basis.

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Represents limited partnership interests held by the entity as of the balance sheet date.

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of other assets.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Fair Value of Assets and Liabilities - Assets and liabilities measured at fair value on a recurring and non-recurring basis (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Assets
Fixed income securities:	$ 56,891	$ 58,992
Short-term investments	3,123	1,944
Other investments: Free-standing derivatives	1		$ 1
Separate account assets	3,271	3,444
Counterparty and cash collateral netting	$ (23)	$ (6)
% of total assets at fair value	0.00%	0.00%
Total	$ 71,935
Liabilities
Counterparty and cash collateral netting	$ 2	$ 14
Counterparty and cash collateral netting as a percent of liabilities measured at fair value	(0.60%)	(3.90%)
U.S. government and agencies
Assets
Fixed income securities:	$ 3,206	$ 3,616
Municipal
Assets
Fixed income securities:	9,628	8,328
Foreign government
Assets
Fixed income securities:	926	1,021
Residential mortgage-backed securities (“RMBS”)
Assets
Fixed income securities:	520	578
Commercial mortgage-backed securities (“CMBS”)
Assets
Fixed income securities:	88	128
Redeemable preferred stock
Assets
Fixed income securities:	23	23
Quoted prices in active markets for identical assets (Level 1)
Assets
Total assets at fair value	$ 13,512	$ 12,819
% of total assets at fair value	19.20%	18.00%
Liabilities
Total liabilities at fair value	$ 0	$ (1)
Liabilities as a percent of liabilities measured at fair value	0.00%	0.30%
Significant other observable inputs (Level 2)
Assets
Total assets at fair value	$ 56,011	$ 57,478
% of total assets at fair value	79.70%	80.80%
Liabilities
Total liabilities at fair value	$ (46)	$ (83)
Liabilities as a percent of liabilities measured at fair value	15.10%	23.30%
Significant unobservable inputs (Level 3)
Assets
Total assets at fair value	$ 785	$ 840
% of total assets at fair value	1.10%	1.20%
Liabilities
Total liabilities at fair value	$ (260)	$ (286)
Liabilities as a percent of liabilities measured at fair value	85.50%	80.30%
Investments reported at NAV
Assets
Investments reported at NAV	$ 1,650
Recurring
Assets
Other investments: Free-standing derivatives, Counterparty and cash collateral netting	(23)	$ (6)
Liabilities
Counterparty and cash collateral netting	2	14
Recurring \| Quoted prices in active markets for identical assets (Level 1)
Assets
Fixed income securities:	2,725	3,079
Equity securities	6,240	6,032
Short-term investments	1,276	264
Other investments: Free-standing derivatives	0	0
Separate account assets	3,271	3,444
Total assets at fair value	13,512	12,819
Liabilities
Other liabilities: Free-standing derivatives	0	(1)
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| U.S. government and agencies
Assets
Fixed income securities:	2,725	3,079
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Municipal
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Corporate - public
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Corporate - privately placed
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Foreign government
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| ABS - CDO
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| ABS - consumer and other
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Residential mortgage-backed securities (“RMBS”)
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Commercial mortgage-backed securities (“CMBS”)
Assets
Fixed income securities:	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Redeemable preferred stock
Assets
Fixed income securities:	0	0
Recurring \| Significant other observable inputs (Level 2)
Assets
Fixed income securities:	53,681	55,307
Equity securities	357	379
Short-term investments	1,847	1,660
Other investments: Free-standing derivatives	126	132
Separate account assets	0	0
Total assets at fair value	56,011	57,478
Liabilities
Other liabilities: Free-standing derivatives	(46)	(83)
Recurring \| Significant other observable inputs (Level 2) \| U.S. government and agencies
Assets
Fixed income securities:	481	537
Recurring \| Significant other observable inputs (Level 2) \| Municipal
Assets
Fixed income securities:	9,522	8,227
Recurring \| Significant other observable inputs (Level 2) \| Corporate - public
Assets
Fixed income securities:	30,594	31,963
Recurring \| Significant other observable inputs (Level 2) \| Corporate - privately placed
Assets
Fixed income securities:	10,550	11,731
Recurring \| Significant other observable inputs (Level 2) \| Foreign government
Assets
Fixed income securities:	926	1,021
Recurring \| Significant other observable inputs (Level 2) \| ABS - CDO
Assets
Fixed income securities:	378	480
Recurring \| Significant other observable inputs (Level 2) \| ABS - consumer and other
Assets
Fixed income securities:	625	645
Recurring \| Significant other observable inputs (Level 2) \| Residential mortgage-backed securities (“RMBS”)
Assets
Fixed income securities:	520	578
Recurring \| Significant other observable inputs (Level 2) \| Commercial mortgage-backed securities (“CMBS”)
Assets
Fixed income securities:	62	102
Recurring \| Significant other observable inputs (Level 2) \| Redeemable preferred stock
Assets
Fixed income securities:	23	23
Recurring \| Significant unobservable inputs (Level 3)
Assets
Fixed income securities:	485	606
Equity securities	291	210
Short-term investments	0	20
Other investments: Free-standing derivatives	1	1
Separate account assets	0	0
Total assets at fair value	777	837
Liabilities
Other liabilities: Free-standing derivatives	0	0
Recurring \| Significant unobservable inputs (Level 3) \| U.S. government and agencies
Assets
Fixed income securities:	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Municipal
Assets
Fixed income securities:	106	101
Recurring \| Significant unobservable inputs (Level 3) \| Corporate - public
Assets
Fixed income securities:	76	108
Recurring \| Significant unobservable inputs (Level 3) \| Corporate - privately placed
Assets
Fixed income securities:	195	224
Recurring \| Significant unobservable inputs (Level 3) \| Foreign government
Assets
Fixed income securities:	0	0
Recurring \| Significant unobservable inputs (Level 3) \| ABS - CDO
Assets
Fixed income securities:	9	99
Recurring \| Significant unobservable inputs (Level 3) \| ABS - consumer and other
Assets
Fixed income securities:	73	48
Recurring \| Significant unobservable inputs (Level 3) \| Residential mortgage-backed securities (“RMBS”)
Assets
Fixed income securities:	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Commercial mortgage-backed securities (“CMBS”)
Assets
Fixed income securities:	26	26
Recurring \| Significant unobservable inputs (Level 3) \| Redeemable preferred stock
Assets
Fixed income securities:	0	0
Non-recurring \| Quoted prices in active markets for identical assets (Level 1)
Assets
Total assets at fair value	0	0
Non-recurring \| Significant other observable inputs (Level 2)
Assets
Total assets at fair value	0	0
Non-recurring \| Significant unobservable inputs (Level 3)
Assets
Total assets at fair value	8	3
Derivatives embedded in life and annuity contracts \| Recurring \| Quoted prices in active markets for identical assets (Level 1)
Liabilities
Contractholder funds: Derivatives embedded in life and annuity contracts	0	0
Derivatives embedded in life and annuity contracts \| Recurring \| Significant other observable inputs (Level 2)
Liabilities
Contractholder funds: Derivatives embedded in life and annuity contracts	0	0
Derivatives embedded in life and annuity contracts \| Recurring \| Significant unobservable inputs (Level 3)
Liabilities
Contractholder funds: Derivatives embedded in life and annuity contracts	(260)	(286)
Fair value
Assets
Total assets at fair value	$ 70,285	$ 71,131
% of total assets at fair value	100.00%	100.00%
Liabilities
Total liabilities at fair value	$ (304)	$ (356)
Liabilities as a percent of liabilities measured at fair value	100.00%	100.00%
Fair value \| Recurring
Assets
Fixed income securities:	$ 56,891	$ 58,992
Equity securities	6,888	6,621
Short-term investments	3,123	1,944
Other investments: Free-standing derivatives	104	127
Separate account assets	3,271	3,444
Total assets at fair value	70,277	71,128
Liabilities
Other liabilities: Free-standing derivatives	(44)	(70)
Fair value \| Recurring \| U.S. government and agencies
Assets
Fixed income securities:	3,206	3,616
Fair value \| Recurring \| Municipal
Assets
Fixed income securities:	9,628	8,328
Fair value \| Recurring \| Corporate - public
Assets
Fixed income securities:	30,670	32,071
Fair value \| Recurring \| Corporate - privately placed
Assets
Fixed income securities:	10,745	11,955
Fair value \| Recurring \| Foreign government
Assets
Fixed income securities:	926	1,021
Fair value \| Recurring \| ABS - CDO
Assets
Fixed income securities:	387	579
Fair value \| Recurring \| ABS - consumer and other
Assets
Fixed income securities:	698	693
Fair value \| Recurring \| Residential mortgage-backed securities (“RMBS”)
Assets
Fixed income securities:	520	578
Fair value \| Recurring \| Commercial mortgage-backed securities (“CMBS”)
Assets
Fixed income securities:	88	128
Fair value \| Recurring \| Redeemable preferred stock
Assets
Fixed income securities:	23	23
Fair value \| Non-recurring
Assets
Total assets at fair value	8	3
Liabilities
Limited partnership interests	2	3
Other Assets, Fair Value Disclosure	6
Fair value \| Derivatives embedded in life and annuity contracts \| Recurring
Liabilities
Contractholder funds: Derivatives embedded in life and annuity contracts	(260)	(286)
Fixed Income Securities Valued Based on Nonbinding Broker Quotes
Assets
Total assets at fair value	251	271
Municipal Not Rated by Third Party Credit Rating Agencies
Assets
Total assets at fair value	$ 57	$ 58