Variable Interest Entities (Asset & Liability Balances) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Liabilities
Assets		$ 165,883	$ 151,828
Liabilities		160,016	146,099
Nonconsolidated VIEs [Member] | Investment in non-consolidated CLOs [Member]
Liabilities
Assets		3	4
Nonconsolidated VIEs [Member] | Property Funds [Member]
Liabilities
Assets		23	12
Nonconsolidated VIEs [Member] | Sponsored hedge funds and private equity funds [Member]
Liabilities
Assets		0	0
Nonconsolidated VIEs [Member] | Non-U.S. Series Fund [Member]
Liabilities
Assets		20	15
Nonconsolidated VIEs [Member] | Affordable housing partnerships and other real estate partnerships [Member]
Liabilities
Assets		200	270
Liabilities		9	15
Consolidated investment entities [Member]
Liabilities
Unfunded commitments		13	21
Consolidated investment entities [Member]
Assets
Other assets		2	0
Liabilities
Debt	[1]	1,913	1,628
Estimated fair value of CLO debt		2,000	1,700
Consolidated investment entities [Member] | Recurring basis [Member]
Assets
Investments, Fair Value Disclosure		1,918	1,606
Receivables		16	8
Other assets		2
Total assets at fair value		1,936	1,614
Liabilities
Debt	[1]	1,913	1,628
Other liabilities		69	84
Total liabilities at fair value		1,982	1,712
Consolidated investment entities [Member] | Recurring basis [Member] | Corporate debt securities [Member]
Assets
Investments, Fair Value Disclosure		8	8
Consolidated investment entities [Member] | Recurring basis [Member] | Common stocks [Member]
Assets
Investments, Fair Value Disclosure		1	1
Consolidated investment entities [Member] | Recurring basis [Member] | Syndicated loans [Member]
Assets
Investments, Fair Value Disclosure		1,909	1,597
Consolidated investment entities [Member] | Recurring basis [Member] | Level 1 [Member]
Assets
Investments, Fair Value Disclosure		0	1
Total assets at fair value		0	1
Consolidated investment entities [Member] | Recurring basis [Member] | Level 1 [Member] | Common stocks [Member]
Assets
Investments, Fair Value Disclosure			1
Consolidated investment entities [Member] | Recurring basis [Member] | Level 2 [Member]
Assets
Investments, Fair Value Disclosure		1,826	1,462
Receivables		16	8
Total assets at fair value		1,842	1,470
Liabilities
Debt	[1]	1,913	1,628
Other liabilities		69	84
Total liabilities at fair value		1,982	1,712
Consolidated investment entities [Member] | Recurring basis [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets
Investments, Fair Value Disclosure		8	8
Consolidated investment entities [Member] | Recurring basis [Member] | Level 2 [Member] | Common stocks [Member]
Assets
Investments, Fair Value Disclosure		1
Consolidated investment entities [Member] | Recurring basis [Member] | Level 2 [Member] | Syndicated loans [Member]
Assets
Investments, Fair Value Disclosure		1,817	1,454
Consolidated investment entities [Member] | Recurring basis [Member] | Level 3 [Member]
Assets
Investments, Fair Value Disclosure		92	143
Other assets		2
Total assets at fair value		94	143
Consolidated investment entities [Member] | Recurring basis [Member] | Level 3 [Member] | Syndicated loans [Member]
Assets
Investments, Fair Value Disclosure		$ 92	$ 143

[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 $2.0 billion and $1.7 billion as of December 31, 2020 and 2019, respectively.