Summary of Significant Accounting Policies (Details) - Updated Guidance - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Decrease in shareholders' equity		$ (21,560)	$ (28,887)	$ (29,201)
Retained earnings [Member]
New Accounting Pronouncements
Decrease in shareholders' equity	$ (36,977)	$ (43,516)	$ (41,555)	$ (38,771)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained earnings [Member]
New Accounting Pronouncements
Decrease in shareholders' equity	$ 43