Investments (Details) - Net Unrealized Investment Gains (Losses) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	$ (9,640)	$ (1,671)	$ 2,352
Income tax expense (benefit)	(2,002)	(362)	490
Change in net unrealized gains (losses) on investment securities, net of tax	(7,638)	(1,309)	1,862
Balance, beginning of year	1,193
Balance, end of year	(6,445)	1,193
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	(9,640)	(1,671)	2,352
Income tax expense (benefit)	(2,002)	(362)	490
Change in net unrealized gains (losses) on investment securities, net of tax	(7,638)	(1,309)	1,862
Changes in Net Unrealized Gains (Losses) on Investment Securities [Member]
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	(9,280)	(2,115)	2,322
Income tax expense (benefit)	(1,967)	(456)	494
Change in net unrealized gains (losses) on investment securities, net of tax	(7,313)	(1,659)	1,828
Balance, beginning of year	2,415	4,074	2,246
Balance, end of year	(4,898)	2,415	4,074
Changes in Net Unrealized Gains (Losses) on Investment Securities [Member] | Fixed maturities [Member]
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	(9,279)	(2,113)	2,322
Changes in Net Unrealized Gains (Losses) on Investment Securities [Member] | Other investments [Member]
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	$ (1)	$ (2)	$ 0