Acquisitions and Dispositions - Financial results from discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Costs and expenses
Income tax expense (benefit)	$ 297	$ 23	$ (73)	$ (59)
Income (loss) from discontinued operations, net of tax	196	144	(3,597)	(144)
Income (loss) from discontinued operations, net of tax	196	144	(3,597)	(144)
Discontinued Operations, Held-for-sale
Revenues
Life premiums and contract charges	336	341	676	676
Net investment income	385	189	824	364
Realized capital gains (losses)	110	264	189	(36)
Total revenues	831	794	1,689	1,004
Costs and expenses
Life contract benefits	386	374	796	734
Interest credited to contractholder funds	159	191	244	314
Amortization of DAC	21	5	57	41
Operating costs and expenses	51	57	23	118
Restructuring and related charges	4	1	106	2
Total costs and expenses	621	628	1,226	1,209
Amortization of deferred gain on reinsurance	2	1	4	2
Income (loss) from discontinued operations before income tax expense	212	167	467	(203)
Income tax expense (benefit)	43	23	93	(59)
Income (loss) from discontinued operations, net of tax	169	144	374	(144)
Loss on disposition of operations	281	0	(4,137)	0
Income tax expense (benefit)	254	0	(166)	0
Loss on disposition, net of tax	27	0	(3,971)	0
Income (loss) from discontinued operations, net of tax	$ 169	$ 144	$ 374	$ (144)