New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 6,239	$ 9,096
Total stockholders equity	4,101	20,272	$ 22,699
Accumulated other comprehensive income (loss)	$ (7,668)	$ 6,441
Accounting Standards Update 2018-12 [Member] | Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			6,000
Total stockholders equity			1,400
Accumulated other comprehensive income (loss)			4,400
Accounting Standards Update 2018-12 [Member] | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			6,500
Total stockholders equity			1,900
Accumulated other comprehensive income (loss)			$ 4,900