Consolidated Statements of Operations and Comprehensive Income (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Total net realized gains (losses) reclassified from AOCI	$ (10)	$ 49	$ 26	$ (303)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ (3)	$ 7	$ (5)	$ (35)