Summary of Significant Accounting Policies - Schedule of After-Tax Cumulative Effect of Change in Accounting Principle on Transition Date (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impact of adoption [Line Items]
Decrease to equity	$ (17,630)	$ (17,363)	$ (24,892)	$ 298
Retained income
Impact of adoption [Line Items]
Decrease to equity	(49,716)	(50,970)	(53,288)	(52,767)
Retained income | Cumulative effect of change in accounting principle
Impact of adoption [Line Items]
Decrease to equity		0	0	21
AOCI
Impact of adoption [Line Items]
Decrease to equity	$ 700	2,392	(426)	(3,304)
AOCI | Cumulative effect of change in accounting principle
Impact of adoption [Line Items]
Decrease to equity		$ 0	$ 0	$ 277