Held for Sale Classification Held for Sale Classification (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds from sale of business	$ 1,050
Net proceeds from sale of business	950
Assets
Total assets held for sale	2,027
Liabilities
Policyholder account balances, future policy benefits and claims	30,183	$ 30,124
Total liabilities held for sale	1,141
Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of investments classified as held for sale	5
Assets
Cash and cash equivalents	166
Investments	1,599
Receivables	216
Deferred acquisition costs	16
Other assets	30
Liabilities
Policyholder account balances, future policy benefits and claims	686
Accounts payable and accrued expenses	81
Other liabilities	$ 374