Fair Value - Changes in FV under the FV Option (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value gains (losses)	$ 292	$ (17)	$ 1,301	$ 321
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value gains (losses)	(209)	28	(587)	48
Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value gains (losses)	$ 787	$ 62	$ 2,400	$ 346