Business, Basis of Presentation and Summary of Significant Accounting Policies - Future Adoption (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 27,287	$ 67,749		$ 74,817	$ 66,382
Accumulated Other Comprehensive Income (Loss), Net of Tax	(27,083)	10,919		$ 18,072	13,052
Retained Earnings (Accumulated Deficit)	$ 41,953	$ 41,197
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					$ (121)
Cumulative Effect, Period of Adoption, Adjustment | Pro Forma | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ (22,500)
Accumulated Other Comprehensive Income (Loss), Net of Tax			(17,500)
Retained Earnings (Accumulated Deficit)			$ (5,000)