Reinsurance (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Premiums, reinsurance and other receivables	$ 13,113	$ 12,918
Deferred policy acquisition costs and value of business acquired	5,086	5,623	$ 6,339
Liabilities:
Future policy benefits	35,588	35,715
Policyholder account balances	39,330	37,069
Other Policyholder Funds	2,728	2,720
Other liabilities	3,455	4,419
Assumed
Assets:
Premiums, reinsurance and other receivables	60	43
Liabilities:
Policyholder account balances	1,744	710
Other Policyholder Funds	1,677	1,683
Other liabilities	(4)	(6)
Assumed | Affiliated Entity
Assets:
Premiums, reinsurance and other receivables	21	34
Liabilities:
Policyholder account balances	386	436
Other Policyholder Funds	14	1,683
Other liabilities	(38)	(8)
Ceded
Assets:
Premiums, reinsurance and other receivables	12,669	12,508
Liabilities:
Policyholder account balances	0	0
Other Policyholder Funds	0	0
Other liabilities	655	701
Ceded | Affiliated Entity
Assets:
Premiums, reinsurance and other receivables	0	3,254
Liabilities:
Policyholder account balances	0	0
Other Policyholder Funds	0	0
Other liabilities	$ 0	$ 401