Fair Value Measurements (excluding Consolidated Investment Entities) - Level 3 Financial Instruments (Details) - Measured at fair value on a recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Assets held in separate accounts
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	$ 141	$ 67	$ 116	$ 62
Total Realized/Unrealized Gains (Losses) Included in Net income	2	2	(1)	3
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	33	33	80	39
Issuances	0	0	0	0
Sales	0	0	(1)	0
Settlements	0	0	0	0
Transfers in to Level 3	3	0	3	3
Transfers out of Level 3	(5)	0	(23)	(5)
Fair Value, Assets, ending balance	174	102	174	102
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0
Other derivatives, net
Fixed Maturities and Equity Securities Rollforward:
Change In Unrealized Gains (Losses) Included in OCI			0
IUL
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI			0
Guaranteed benefit derivatives
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	(253)	(41)	(60)	(44)
Total Realized/Unrealized Gains (Losses) Included in Net income	45	(13)	(148)	(8)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	(2)	(7)	(2)	(7)
Sales	0	0	0	0
Settlements	0	4	0	2
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(210)	(57)	(210)	(57)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0
U.S. corporate public securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	66	73	74	34
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	(2)	0	(2)	1
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	(5)	(3)	(5)
Transfers in to Level 3	43	0	38	38
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	107	68	107	68
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	(2)		(2)
U.S. corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	1,291	1,280	1,457	1,134
Total Realized/Unrealized Gains (Losses) Included in Net income	1	0	1	1
Total Realized/Unrealized Gains (Losses) Included in OCI	83	24	10	67
Purchases	25	6	71	135
Issuances	0	0	0	0
Sales	(13)	0	(16)	(14)
Settlements	(49)	(6)	(130)	(18)
Transfers in to Level 3	92	0	88	0
Transfers out of Level 3	(40)	(10)	(91)	(11)
Fair Value, Assets, ending balance	1,390	1,294	1,390	1,294
Change In Unrealized Gains (Losses) Included in Earnings	1	0	1	1
Change In Unrealized Gains (Losses) Included in OCI	83		10
Foreign corporate public securities and foreign governments
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	4	0	0	0
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(4)	0	0	0
Fair Value, Assets, ending balance	0	0	0	0
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0		0
Foreign corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	277	218	328	217
Total Realized/Unrealized Gains (Losses) Included in Net income	(4)	0	(7)	(25)
Total Realized/Unrealized Gains (Losses) Included in OCI	32	4	(18)	38
Purchases	0	70	3	142
Issuances	0	0	0	0
Sales	(2)	0	(6)	(80)
Settlements	(4)	0	(5)	0
Transfers in to Level 3	6	0	10	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	305	292	305	292
Change In Unrealized Gains (Losses) Included in Earnings	(4)	0	(4)	1
Change In Unrealized Gains (Losses) Included in OCI	32		(18)
Residential mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	30	49	23	28
Total Realized/Unrealized Gains (Losses) Included in Net income	0	(2)	(2)	(4)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	24	0	24	8
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(16)	(17)	(7)	(2)
Fair Value, Assets, ending balance	38	30	38	30
Change In Unrealized Gains (Losses) Included in Earnings	0	(2)	(2)	(4)
Change In Unrealized Gains (Losses) Included in OCI	0		0
Commercial mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance		13		14
Total Realized/Unrealized Gains (Losses) Included in Net income		0		0
Total Realized/Unrealized Gains (Losses) Included in OCI		0		0
Purchases		3		3
Issuances		0		0
Sales		0		0
Settlements		0		0
Transfers in to Level 3		0		0
Transfers out of Level 3		(13)		(14)
Fair Value, Assets, ending balance		3		3
Change In Unrealized Gains (Losses) Included in Earnings		0		0
Other asset-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	87	131	78	127
Total Realized/Unrealized Gains (Losses) Included in Net income	(8)	0	(8)	0
Total Realized/Unrealized Gains (Losses) Included in OCI	1	0	1	0
Purchases	20	8	30	12
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(1)	(2)	(2)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	(56)	0	(55)
Fair Value, Assets, ending balance	99	82	99	82
Change In Unrealized Gains (Losses) Included in Earnings	(8)	0	(8)	0
Change In Unrealized Gains (Losses) Included in OCI	1		1
Fixed maturities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	1,755	1,764	1,960	1,554
Total Realized/Unrealized Gains (Losses) Included in Net income	(11)	(2)	(16)	(28)
Total Realized/Unrealized Gains (Losses) Included in OCI	114	28	(9)	106
Purchases	69	87	128	300
Issuances	0	0	0	0
Sales	(15)	0	(22)	(94)
Settlements	(54)	(12)	(140)	(25)
Transfers in to Level 3	141	0	136	38
Transfers out of Level 3	(60)	(96)	(98)	(82)
Fair Value, Assets, ending balance	1,939	1,769	1,939	1,769
Change In Unrealized Gains (Losses) Included in Earnings	(11)	(2)	(13)	(2)
Change In Unrealized Gains (Losses) Included in OCI	114		(9)
Equity securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	119	150	128	104
Total Realized/Unrealized Gains (Losses) Included in Net income	14	6	5	10
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	30	0	30	42
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(2)	0	(2)	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	161	156	161	156
Change In Unrealized Gains (Losses) Included in Earnings	14	6	5	10
Change In Unrealized Gains (Losses) Included in OCI	0		0
Discontinued Operations, Held-for-sale \| Other derivatives, net
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	83	137	202	83
Total Realized/Unrealized Gains (Losses) Included in Net income	77	10	(50)	61
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	14	12	28	22
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(7)	(10)	(13)	(19)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	167	148	167	148
Change In Unrealized Gains (Losses) Included in Earnings	84	11	(35)	65
Change In Unrealized Gains (Losses) Included in OCI	0		0
Discontinued Operations, Held-for-sale \| IUL
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	(81)	(146)	(217)	(82)
Total Realized/Unrealized Gains (Losses) Included in Net income	(89)	(13)	56	(76)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	(18)	(15)	(34)	(28)
Sales	0	0	0	0
Settlements	11	14	18	26
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(177)	(160)	(177)	(160)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0		0
Discontinued Operations, Held-for-sale \| U.S. corporate public securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	34	35	32	10
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	(2)	0	0	1
Purchases	(1)	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(1)	0
Transfers in to Level 3	0	0	0	22
Transfers out of Level 3	0	4	0	2
Fair Value, Assets, ending balance	31	31	31	31
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	1
Change In Unrealized Gains (Losses) Included in OCI	(2)		0
Discontinued Operations, Held-for-sale \| U.S. corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	288	285	316	259
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	21	6	4	17
Purchases	10	0	19	19
Issuances	0	0	0	0
Sales	(13)	0	(13)	0
Settlements	(7)	3	(17)	7
Transfers in to Level 3	16	0	17	0
Transfers out of Level 3	(11)	0	(22)	0
Fair Value, Assets, ending balance	304	288	304	288
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	21		4
Discontinued Operations, Held-for-sale \| Foreign corporate public securities and foreign governments
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	3	9	7	11
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	(1)	(4)	(3)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	3	8	3	8
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0		(4)
Discontinued Operations, Held-for-sale \| Foreign corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	68	48	80	34
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	(4)
Total Realized/Unrealized Gains (Losses) Included in OCI	13	3	0	9
Purchases	0	27	1	52
Issuances	0	0	0	0
Sales	0	0	0	13
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	81	78	81	78
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	13		(1)
Discontinued Operations, Held-for-sale \| Residential mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	0	0	0	0
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0		0
Discontinued Operations, Held-for-sale \| Commercial mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance		3		0
Total Realized/Unrealized Gains (Losses) Included in Net income		0		0
Total Realized/Unrealized Gains (Losses) Included in OCI		0		0
Purchases		0		0
Issuances		0		0
Sales		0		0
Settlements		0		0
Transfers in to Level 3		0		0
Transfers out of Level 3		3		0
Fair Value, Assets, ending balance		0		0
Change In Unrealized Gains (Losses) Included in Earnings		0		0
Discontinued Operations, Held-for-sale \| Other asset-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	7	13	6	11
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	1	8	3	8
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(1)	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	7	0	5
Fair Value, Assets, ending balance	8	14	8	14
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0		0
Discontinued Operations, Held-for-sale \| Fixed maturities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	400	393	441	325
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	(4)
Total Realized/Unrealized Gains (Losses) Included in OCI	32	8	0	24
Purchases	10	35	23	79
Issuances	0	0	0	0
Sales	(13)	0	(13)	13
Settlements	(7)	3	(19)	7
Transfers in to Level 3	16	0	17	22
Transfers out of Level 3	(11)	14	(22)	7
Fair Value, Assets, ending balance	427	419	427	419
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	1
Change In Unrealized Gains (Losses) Included in OCI	32		(1)
Discontinued Operations, Held-for-sale \| Equity securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	30	34	33	25
Total Realized/Unrealized Gains (Losses) Included in Net income	3	2	0	4
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	7
Issuances	0	0	0	0
Sales	(30)	0	(30)	0
Settlements	(1)	0	(1)	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	2	36	2	36
Change In Unrealized Gains (Losses) Included in Earnings	0	$ 2	(1)	$ 4
Change In Unrealized Gains (Losses) Included in OCI	$ 0		$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances 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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- 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.

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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.

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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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- Definition

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

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- Definition

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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (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://fasb.org/us-gaap/role/ref/legacyRef
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