Variable Interest Entities (Asset & Liability Balances) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Liabilities
Assets		$ 158,687	$ 151,828
Liabilities		152,620	146,099
Nonconsolidated VIEs [Member] | Investment in non-consolidated CLOs [Member]
Liabilities
Assets		2	4
Nonconsolidated VIEs [Member] | Property funds [Member]
Liabilities
Assets		21	12
Nonconsolidated VIEs [Member] | Sponsored hedge funds and private equity funds [Member]
Liabilities
Assets		0	0
Nonconsolidated VIEs [Member] | Non-U.S. series funds [Member]
Liabilities
Assets		24	15
Nonconsolidated VIEs [Member] | Affordable housing partnerships and other real estate partnerships[Member]
Liabilities
Assets		202	270
Liabilities		9	15
Variable Interest Entity, Primary Beneficiary [Member]
Liabilities
Estimated fair value of CLO debt		1,900	1,700
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets
Investments		1,903	1,606
Receivables		9	8
Total assets at fair value		1,912	1,614
Liabilities
Debt	[1]	1,901	1,628
Other liabilities		220	84
Total liabilities at fair value		2,121	1,712
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Corporate debt securities [Member]
Assets
Investments		14	8
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Common stocks [Member]
Assets
Investments		2	1
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Syndicated loans [Member]
Assets
Investments		1,887	1,597
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member]
Assets
Investments		0	1
Total assets at fair value		0	1
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | Common stocks [Member]
Assets
Investments			1
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member]
Assets
Investments		1,785	1,462
Receivables		9	8
Total assets at fair value		1,794	1,470
Liabilities
Debt	[1]	1,901	1,628
Other liabilities		220	84
Total liabilities at fair value		2,121	1,712
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets
Investments		14	8
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Common stocks [Member]
Assets
Investments		2
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Syndicated loans [Member]
Assets
Investments		1,769	1,454
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member]
Assets
Investments		118	143
Total assets at fair value		118	143
Recurring basis [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Syndicated loans [Member]
Assets
Investments		118	143
Variable Interest Entity, Primary Beneficiary [Member]
Liabilities
Debt	[1]	$ 1,901	$ 1,628

[1] The carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. The estimated fair value of the CLOs’ debt was $1.9 billion and $1.7 billion as of September 30, 2020 and December 31, 2019, respectively.