Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2022		Dec. 31, 2021
Held-to-maturity securities, Fair Value		$ 40,572	[1]	$ 41,812
Securities, pledged as collateral		855		557
Mortgage loans, carried at fair value		$ 2,203		$ 6,623
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)		640,053,754		642,223,571
Available-for-Sale Securities [Member]
Securities, pledged as collateral	[2]	$ 855		$ 557
Trading Assets, Excluding Debt and Equity Securities [Member]
Securities, pledged as collateral	[2]	$ 1,111		$ 1,193

[1] The weighted-average maturity of total held-to-maturity investment securities was 7.4 years at December 31, 2021, with a corresponding weighted-average yield of 1.45 percent. The weighted-average maturity of total available-for-sale investment securities was 5.5 years at December 31, 2021, with a corresponding weighted-average yield of 1.73 percent.

[2] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.