Business Dispositions and Discontinued Operations - Reconciliation of the Major Line Items Constituting Pretax Profit (Loss) of Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Benefits, losses and expenses
Income (loss) from discontinued operations, net of tax	$ 0	$ 322	$ (2,869)
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Revenues
Earned premiums		39	106
Fee income and other		382	912
Net investment income		519	1,289
Net realized capital losses		(68)	(53)
Total revenues		872	2,254
Benefits, losses and expenses
Benefits, losses and loss adjustment expenses		535	1,416
Amortization of DAC		58	45
Insurance operating costs and other expenses		157	368
Total benefits, losses and expenses		750	1,829
Income before income taxes		122	425
Income tax expense		2	37
Income from operations of discontinued operations, net of tax		120	388
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax		202	(3,257)
Income (loss) from discontinued operations, net of tax		$ 322	$ (2,869)