Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Jan. 01, 2023	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity		$ 41,001	$ 46,824	$ 68,912	$ 65,659	$ 66,908	$ 67,199
ASU 2018-12 | Cumulative effect of change in accounting principle | Forecast | Minimum
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity	$ (1,000)
ASU 2018-12 | Cumulative effect of change in accounting principle | Forecast | Maximum
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity	$ (3,000)