Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
Held-to-maturity securities, Fair Value	$ 70,359	[1]	$ 77,874
Mortgage loans, carried at fair value	2,263		1,849
Deposits fair value	$ 444		$ 0
Common stock, par value	$ 0.01		$ 0.01
Common stock, share-authorized (actual number of shares)	4,000,000,000		4,000,000,000
Common stock, shares issued (actual number of shares)	2,125,725,742		2,125,725,742
Treasury stock, shares (actual number of shares)	568,744,300		594,747,484
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits fair value	$ 444
Available-for-Sale Securities [Member]
Securities, pledged as collateral	292		$ 858
Trading Assets, Excluding Debt and Equity Securities [Member] | Asset Pledged as Collateral with Right [Member]
Securities, pledged as collateral	$ 2,585		$ 702

[1] The weighted-average maturity of total held-to-maturity investment securities was 9.2 years at December 31, 2022, with a corresponding weighted-average yield of 2.18 percent. The weighted-average maturity of total available-for-sale investment securities was 7.4 years at December 31, 2022, with a corresponding weighted-average yield of 2.94 percent.