New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 5,929		$ 5,929		$ 9,272	$ 13,014
Other Comprehensive Income (Loss), Net of Tax	(3,504)	$ 1,039	(7,201)	$ (1,318)
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,000		1,000
Other Comprehensive Income (Loss), Net of Tax			5,100
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,300		1,300
Other Comprehensive Income (Loss), Net of Tax			7,100
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	500		500
Other Comprehensive Income (Loss), Net of Tax			3,200
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 800		800
Other Comprehensive Income (Loss), Net of Tax			$ 5,200