Business Disposition and Discontinued Operations - Reconciliation of the Major Line Items Constituting Pretax Profit (Loss) of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Benefits, losses and expenses
Income from discontinued operations, net of tax	$ 0	$ 5	$ 0	$ 322
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Revenues
Earned premiums		0		39
Fee income and other		0		382
Net investment income		0		519
Net realized capital gains (losses)		4		(68)
Total revenues		4		872
Benefits, losses and expenses
Benefits, losses and loss adjustment expenses		0		535
Amortization of DAC		0		58
Insurance operating costs and other expenses [1]		(5)		157
Total benefits, losses and expenses		(5)		750
Income before income taxes		9		122
Income tax expense (benefit)		(7)		2
Income from operations of discontinued operations, net of tax		16		120
Net realized capital gain (loss) on disposal, net of tax		(11)		202
Income from discontinued operations, net of tax		$ 5		$ 322