Business, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) segment	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments | segment	3
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 6,697	$ 10,872	$ 16,111	$ 16,408	$ 16,294		$ 18,115
Retained earnings (deficit)	$ (4,704)		$ (5,653)
Cumulative effect of change in accounting principle, net of income tax | Minimum | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						$ 6,000
Retained earnings (deficit)						3,000
Cumulative effect of change in accounting principle, net of income tax | Maximum | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						8,000
Retained earnings (deficit)						$ 4,000