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v3.21.1

Segment Information Segment Information (Asset Management and Service Fees) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Asset management and service fees | $ 1,176 | $ 1,033
Asset-based management fees |  |
Asset management and service fees | 994 | 875
Performance-based incentive fees |  |
Asset management and service fees | 27 | 14
Other fees |  |
Asset management and service fees | $ 155 | $ 144

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- Definition Fees earned during the period for providing management services. + References No definition available. + Details
Name: | us-gaap_InsuranceAgencyManagementFee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ManagementServiceBaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ManagementServiceIncentiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_FinancialServiceOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |