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Related Parties- Investment in MidCap (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Available-for-sale securities	$ 112,225	$ 110,561
Related Party
Related Party Transaction [Line Items]
Trading securities	878	1,781
Available-for-sale securities	9,821	10,402
MidCap | Related Party
Related Party Transaction [Line Items]
Available-for-sale securities		158
MidCap | Related Party
Related Party Transaction [Line Items]
Available-for-sale securities	1,262	897
MidCap | Related Party | Redeemable preferred stock
Related Party Transaction [Line Items]
Trading securities		7
Debt Securities		800
ABS | Related Party
Related Party Transaction [Line Items]
Available-for-sale securities	$ 5,760	6,994
ABS | MidCap | Related Party
Related Party Transaction [Line Items]
Trading securities		$ 635

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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