Segments of Operations - Assets by segment (Details) - USD ($) $ in Millions	Dec. 31, 2021	May 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 28,931		$ 73,710
Assets of discontinued annuity operations	0		47,885
Annuity subsidiaries
Segment Reporting Information [Line Items]
Assets of discontinued annuity operations	0	$ 49,283	47,885
Continuing operations
Segment Reporting Information [Line Items]
Total assets	28,931		25,825
Property and casualty insurance
Segment Reporting Information [Line Items]
Total assets	21,312		19,620
Other
Segment Reporting Information [Line Items]
Total assets	$ 7,619		$ 6,205