Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities (Balances by product) (Details) - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Policyholder account balances		$ 20,021		$ 20,251
Future policy benefits		8,305		8,750
Policy claims and other policyholders' funds		878		903
Policyholder account balances, future policy benefits and claims		29,204		29,904
Fixed annuities [Member]
Policyholder account balances	[1]	9,499		9,934
Variable annuity fixed sub-accounts [Member]
Policyholder account balances		5,127		5,166
VUL/UL insurance [Member]
Policyholder account balances		3,057		3,047
IUL [Member]
Policyholder account balances		1,649		1,384
Other life insurance [Member]
Policyholder account balances		689		720
Variable annuity GMWB [Member]
Future policy benefits		(125)	[2]	463
Variable annuity GMAB [Member]
Future policy benefits	[3]	(83)		(80)
Other annuity liabilities [Member]
Future policy benefits		26		78
Fixed annuities life contingent liabilities [Member]
Future policy benefits		1,464		1,484
Life and disability income insurance [Member]
Future policy benefits		1,219		1,221
Long term care insurance [Member]
Future policy benefits		4,997		4,896
VUL/UL and other life insurance additional liabilities [Member]
Future policy benefits		$ 807		$ 688

[1] Includes fixed deferred annuities, non-life contingent fixed payout annuities and indexed annuity host contracts.

[2] Includes the fair value of GMWB embedded derivatives that was a net asset as of September 30, 2018 reported as a contra liability.

[3] Includes the fair value of GMAB embedded derivatives that was a net asset as of both September 30, 2018 and December 31, 2017 reported as a contra liability.