Acquisitions and Dispositions - Financial results from discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Costs and expenses
Income tax expense (benefit)	$ 0	$ (370)
Income (loss) from discontinued operations, net of tax	0	(3,793)
Income (loss) from discontinued operations, net of tax	$ 0	(3,793)
Discontinued Operations, Held-for-sale
Revenues
Life premiums and contract charges		340
Net investment income		439
Net gains (losses) on investments and derivatives		79
Total revenues		858
Costs and expenses
Life contract benefits		410
Interest credited to contractholder funds		85
Amortization of DAC		36
Operating costs and expenses		55
Restructuring and related charges		19
Total costs and expenses		605
Amortization of deferred gain on reinsurance		2
Income (loss) from discontinued operations before income tax expense		255
Income tax expense (benefit)		50
Income (loss) from discontinued operations, net of tax		205
Loss on disposition of operations		(4,418)
Income tax benefit		(420)
Loss on disposition of operations, net of tax		(3,998)
Income (loss) from discontinued operations, net of tax		$ 205