Variable Interest Entities - Changes in Level 3 Assets and Liabilities (Details 3) - Variable Interest Entity, Primary Beneficiary [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Syndicated loans [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		$ 92		$ 143
Total gains (losses) included in net income		2	[1]	(39)
Purchases		59		43
Sales		(10)		(7)
Settlements		(20)		(10)
Transfers into Level 3		57		248
Transfers out of Level 3		(25)		(76)
Balance, at the end of the period		155		302
Changes in unrealized gains (losses) included in income relating to assets held at end of period	[1]	1		$ (37)
Other assets
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		2
Transfers out of Level 3		(2)
Balance, at the end of the period		$ 0

[1] Included in net investment income in the Consolidated Statements of Operations.