Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities (Text) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Fixed annuities liabilities average interest rate	3.94%
Liabilities related to unpaid reported and unreported claims and claim adjustment expenses	$ 891	$ 903
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses	$ 30	41	$ 24
Minimum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Fixed annuities liabilities interest rates	2.71%
Maximum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Fixed annuities liabilities interest rates	9.38%
EIA [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Contract initial term	7 years
Minimum interest rate guarantee	3.00%
Percentage of initial premium receiving interest guarantee	90.00%
Term and whole life insurance [Member] | Minimum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	3.00%
Term and whole life insurance [Member] | Maximum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	10.00%
DI [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Unpaid reported claims interest rate	4.50%
DI [Member] | Minimum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	4.00%
DI [Member] | Maximum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	7.50%
LTC insurance [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Unpaid reported claims interest rate	6.20%
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses		50
LTC insurance [Member] | Minimum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	5.90%
LTC insurance [Member] | Maximum [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Anticipated interest rate for future claims	6.80%
Life, DI and LTC insurance [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Liabilities related to unpaid reported and unreported claims and claim adjustment expenses	$ 1,400	1,300
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses	28		6
Property and casualty [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Liabilities related to unpaid reported and unreported claims and claim adjustment expenses	714	722
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses			18
Auto and home [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses			20
Catastrophe insurance [Member]
Liability for Policyholder Account Balances and Future Policy Benefits and Policy Claims and Other Policyholders Funds [Line Items]
Change in liability for prior year incurred unpaid reported claims and claim adjustment expenses	$ 2	$ (9)	$ (2)