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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

X

- Details

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

X

- Details

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

X

- Details

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