Investments (Details) - Net Unrealized Investment Gains - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	$ (1,671)	$ 2,352	$ 3,140
Income tax expense (benefit)	(362)	490	641
Change in net unrealized gains (losses) on investment securities, net of tax	(1,309)	1,862	2,499
Balance, beginning of year	2,502
Balance, end of year	1,193	2,502
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in net unrealized investment gains (losses) [Roll Forward]
Changes in net unrealized investment gains (losses)	(1,671)	2,352	3,140
Income tax expense (benefit)	(362)	490	641
Change in net unrealized gains (losses) on investment securities, net of tax	(1,309)	1,862	2,499
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)	(2,115)	2,322	2,990
Income tax expense (benefit)	(456)	494	631
Change in net unrealized gains (losses) on investment securities, net of tax	(1,659)	1,828	2,359
Balance, beginning of year	4,074	2,246	(113)
Balance, end of year	2,415	4,074	2,246
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)	(2,113)	2,322	2,990
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)	$ (2)	$ 0	$ 0

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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