Business Held for Sale and Discontinued Operations - Discontinued Operations Income Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Benefits, Losses and Expenses [Abstract]
Income (loss) from discontinued operations, net of tax	$ (128)	$ (20)
Discontinued Operations, Held-for-sale
Benefits, Losses and Expenses [Abstract]
Income (loss) from discontinued operations, net of tax	(128)	(20)
Individual Life Transaction | Discontinued Operations, Held-for-sale
Revenues [Abstract]
Net investment income	169	157
Fee income	174	187
Premiums	7	7
Total net realized capital gains (losses)	(26)	29
Other revenue	(2)	0
Total revenues	322	380
Benefits, Losses and Expenses [Abstract]
Interest credited and other benefits to contract owners/policyholders	238	251
Operating expenses	26	24
Net amortization of Deferred policy acquisition costs and Value of business acquired	12	29
Interest expense	2	2
Total benefits and expenses	278	306
Income (loss) from discontinued operations before income taxes	44	74
Income tax expense (benefit)	9	15
Loss on sale, net of tax	(163)	0
Income (loss) from discontinued operations, net of tax	(128)	59
2018 Transaction | Discontinued Operations, Held-for-sale
Benefits, Losses and Expenses [Abstract]
Income (loss) from discontinued operations, net of tax	$ 0	$ (79)