Reserve for Future Policy Benefits and Separate Account Liabilities Level 4 Account Value by Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jun. 01, 2018	Dec. 31, 2017
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 15,701
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	447
Separate account liabilities	98,814	$ 110,773	$ 115,834
Net Amount at Risk by Product and Guarantee, Separate Account Value	68,575
Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 3,264
Weighted Average [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
MAV Only [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 11,460
MAV Only [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 2,543
MAV Only [Member] | Weighted Average [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
With Five Percent Rollup [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 942
With Five Percent Rollup [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 177
With Five Percent Rollup [Member] | Weighted Average [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
With Five Percent Rollup and EPB [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 400
With Five Percent Rollup and EPB [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 92
With Five Percent Rollup and EPB [Member] | Weighted Average [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	74 years
Reset [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 2,105
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 10
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years
Return of Net Deposit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 5,654
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 76
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
Variable Annuity [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 4,034
With Earnings Protection Benefit Rider (EPB) [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	2,899
With Earnings Protection Benefit Rider (EPB) [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	452
Asset Protection Benefit ("APB") [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	7,958
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 676
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	70 years
Lifetime Income Benefit ("LIB") - Death Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 362
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 8
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
Guaranteed Minimum Death Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 3,387
Separate account liabilities	30,239
Guaranteed Minimum Death Benefit [Member] | Deferred Annuitization [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	1,846		$ 1,900
Guaranteed Minimum Death Benefit [Member] | Variable Annuity [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 33,626
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years
Annuitization Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 680
Annuitization Benefit [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	76
Annuitization Benefit [Member] | MAV Only [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	516
Annuitization Benefit [Member] | With Five Percent Rollup [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	68
Annuitization Benefit [Member] | With Five Percent Rollup and EPB [Member] | Maximum [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	20
Annuitization Benefit [Member] | Reset [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	9
Annuitization Benefit [Member] | Return of Net Deposit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	73
Annuitization Benefit [Member] | Variable Annuity [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	1,217
Guaranteed Lifetime Withdrawal Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 5,000
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	68 years
Guaranteed Minimum Withdrawal Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 0
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	74 years