Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Other assets	$ 19,114	$ 17,689
Total assets	261,108	228,354	$ 189,000
Liabilities and Shareholders’ Equity
Long-term debt	47,866	42,573
Total liabilities	233,051	203,643
Shareholders’ Equity
Total shareholders’ equity	28,057	24,711	$ 22,177	$ 22,984
Total liabilities and shareholders’ equity	261,108	228,354
Parent Company
Assets
Cash and cash equivalents	9,652	8,188
Equity in net assets of subsidiaries and affiliates	28,019	24,702
Loans to subsidiaries and affiliates	25,471	22,658
Due from subsidiaries and affiliates	1,261	1,342
Other assets	349	156
Total assets	64,752	57,046
Liabilities and Shareholders’ Equity
Accounts payable and other liabilities	2,188	2,271
Due to subsidiaries and affiliates	555	632
Long-term debt	33,952	29,432
Total liabilities	36,695	32,335
Shareholders’ Equity
Total shareholders’ equity	28,057	24,711
Total liabilities and shareholders’ equity	$ 64,752	$ 57,046