Held for Sale Classification Held for Sale Classification (Details) - USD ($) $ in Millions		3 Months Ended
	Oct. 01, 2019	Mar. 31, 2019	Sep. 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	$ 1,135
Net proceeds from sale of business	$ 1,035
Assets
Total assets held for sale			$ 1,986
Liabilities
Policyholder account balances, future policy benefits and claims			31,146	$ 30,124
Total liabilities held for sale			1,105
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			204
Investments			1,545
Receivables			197
Deferred acquisition costs			15
Other assets			25
Liabilities
Policyholder account balances, future policy benefits and claims			696
Accounts payable and accrued expenses			28
Other liabilities			$ 381