Acquisition and Disposition - Financial results from discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Costs and expenses
Income tax expense (benefit)	$ 370	$ 82
Loss from discontinued operations, net of tax	(3,793)	(288)
Loss from discontinued operations, net of tax	(3,793)	(288)
Discontinued Operations, Held-for-sale
Revenues
Life premiums and contract charges	340	335
Net investment income	439	175
Realized capital gains (losses)	79	(300)
Total revenues	858	210
Costs and expenses
Life contract benefits	410	360
Interest credited to contractholder funds	85	123
Amortization of DAC	36	36
Operating costs and expenses	55	61
Restructuring and related charges	19	1
Total costs and expenses	605	581
Amortization of deferred gain on reinsurance	2	1
Income (loss) from discontinued operations before income tax expense	255	(370)
Income tax expense (benefit)	50	(82)
Loss from discontinued operations, net of tax	205	(288)
Loss on disposition of operations	(4,418)	0
Income tax benefit	(420)	0
Loss on disposition, net of tax	(3,998)	0
Loss from discontinued operations, net of tax	$ 205	$ (288)