Business, Basis of Presentation and Summary of Significant Accounting Policies - Future Adoption - (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 37,367	$ 54,237	$ 67,749	$ 69,423	$ 66,137		$ 74,817
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17,372)	$ (1,912)	10,919	$ 12,309	$ 10,397		$ 18,072
Retained Earnings (Accumulated Deficit)	$ 41,101		$ 41,197
Cumulative Effect, Period of Adoption, Adjustment | Pro Forma | Accounting Standards Update 2018-12 | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						$ (21,500)
Accumulated Other Comprehensive Income (Loss), Net of Tax						(17,000)
Retained Earnings (Accumulated Deficit)						(4,500)
Cumulative Effect, Period of Adoption, Adjustment | Pro Forma | Accounting Standards Update 2018-12 | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						(24,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax						(18,500)
Retained Earnings (Accumulated Deficit)						$ (5,500)