Held for Sale Classification Held for Sale Classification (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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	29,463	$ 30,124
Total liabilities held for sale	1,171
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	111
Investments	1,634
Receivables	229
Deferred acquisition costs	15
Other assets	38
Liabilities
Policyholder account balances, future policy benefits and claims	709
Accounts payable and accrued expenses	89
Other liabilities	$ 373