Guarantees and Commitments (Financing Commitments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Guarantees and Product Warranties [Abstract]
Unused revolving credit line commitments and other	$ 9,156	$ 6,337
Commitments to provide capital to investees	1,112	1,069
Construction-lending commitments	178	53
Home equity lines of credit	145	168
Mortgage loan origination commitments	14	708
Unconditionally cancelable unfunded commitments	$ 23,600	$ 26,700