Commitments and Contingencies - Tax Credits and Amortization (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Investments in affordable housing projects
Income Tax Contingency [Line Items]
Investment tax credit	$ 137		$ 121	$ 392		$ 360
Amortization and other changes in carrying amount	143		117	391		353
Other Community Development Investment
Income Tax Contingency [Line Items]
Investment tax credit	26		24	73		70
Amortization and other changes in carrying amount	21		21	60		59
Renewable energy investments
Income Tax Contingency [Line Items]
Investment tax credit	31	[1]	36	92	[1]	96
Amortization and other changes in carrying amount	$ 4		$ 1	$ 0		$ 3

[1] Tax credits received for these investments are recorded as a reduction to the carrying value of these investments