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Investments - Investment Related Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Gain (Loss) on Securities [Line Items]
Gross realized gains on investment activity	$ 141	$ 217		$ 324	$ 320
Gross realized losses on investment activity	(112)	(832)		(216)	(1,242)
Net realized investment gains (losses) on AFS securities	29	(615)		108	(922)
Net recognized investment gains (losses) on trading securities	(32)	(161)		32	(368)
Net recognized investment losses on equity securities	(13)	(271)		(31)	(248)
Investment related gains (losses)	366	(5,751)	$ (4,212)	1,431	(9,963)	$ (12,811)
Derivative gains (losses)	421	(3,932)		1,414	(6,973)
Provision for Loan, Lease, and Other Losses	(111)	(172)		(177)	(364)
Other gains	276	499		12	807
Mortgage loans
Gain (Loss) on Securities [Line Items]
Investment related gains (losses)	$ (204)	$ (1,099)		$ 73	$ (1,895)

X

- Definition

Amount of realized gain on 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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