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Variable Interest Entities (Change in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common stocks [Member] |  |  |  |
Summary of changes in Level 3 assets held by consolidated investment entities |  |  |  |
Balance, at the beginning of the period |  |  | $ 0 | $ 4
Total gains (losses) included in net income | [1] |  |  | 6
Sales |  |  |  | (10)
Transfers into Level 3 |  |  |  | 4
Transfers out of Level 3 |  |  |  | (2)
Transfers out of Level 3 from deconsolidation of collateralized loan obligations |  |  |  | (2)
Balance, at the end of the period |  |  |  | 0
Syndicated loans [Member] |  |  |  |
Summary of changes in Level 3 assets held by consolidated investment entities |  |  |  |
Balance, at the beginning of the period |  | $ 143 | 226 | 180
Total gains (losses) included in net income | [1] | (16) | (2) | (1)
Purchases |  | 111 | 91 | 97
Sales |  | (29) | (11) | (41)
Settlements |  | (33) | (68) | (52)
Transfers into Level 3 |  | 438 | 272 | 173
Transfers out of Level 3 |  | (522) | (365) | (160)
Transfers into Level 3 from consolidation of collateralized loan obligations |  |  |  | 54
Transfers out of Level 3 from deconsolidation of collateralized loan obligations |  |  |  | (24)
Balance, at the end of the period |  | 92 | 143 | 226
Changes in unrealized gains (losses) included in income relating to assets held at end of period | [1] | (2) | (3) | $ (4)
Other assets [Member] |  |  |  |
Summary of changes in Level 3 assets held by consolidated investment entities |  |  |  |
Balance, at the beginning of the period |  | 0 |  |
Purchases |  | 2 |  |
Balance, at the end of the period |  | $ 2 | $ 0 |
[1] | Included in net investment income in the Consolidated Statements of Operations.

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers into Level 3 from consolidation of collateralized loan obligations + 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 due to the deconsolidation of collateralized loan obligations. + References No definition available. + Details
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- Definition 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. + 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 (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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. + Details
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- Definition Amount of gain (loss) recognized in income from 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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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