Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	[1]	Jan. 01, 2021
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity	$ (46,491)	$ (46,306)	$ (43,454)	$ (47,225)	$ (58,666)	$ (69,034)		$ (65,935)
Accumulated Other Comprehensive Income (Loss)
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity	18,982	19,329	22,616	18,647	7,028	(5,071)
Retained Earnings
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity	$ (35,916)	$ (34,690)	$ (34,893)	$ (32,092)	$ (29,587)	$ (25,695)
Cumulative effect of change in accounting principle | Minimum | ASU 2018-12 | Accumulated Other Comprehensive Income (Loss)
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity								(2,200)
Cumulative effect of change in accounting principle | Minimum | ASU 2018-12 | Retained Earnings
Summary of Significant Accounting Policies [Line Items]
Stockholders' equity								$ (933)

[1] Updated to reflect the adoption of long-duration targets improvements, see Note 2.