Separate Accounts, Death Benefits and Other Insurance Benefit Features Level 4 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Separate Accounts Disclosure [Line Items]
Liabilities for Guarantees on Long-Duration Contracts, Other Liability Adjustments	$ (238)	$ (211)	$ (265)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	13,762	13,639	13,359
Reinsurance Recoverables on Unpaid Losses	258	511
Reinsurance Recoverable for Paid Claims and Claims Adjustments	(161)	$ (168)
Net Amount at Risk by Product and Guarantee, General Account Value	18,624
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	$ 3,038
Invested in Equity Securities	84.00%	83.00%
Invested in Fixed Income Securities	16.00%	17.00%
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value	$ 36,925	$ 40,423
Movement in Changes in gross GMDB/GMWB and UL secondary guarantee benefits [Roll Forward]
Liabilities, as of Jan. 1	13,850	13,624
Liabilities for Guarantees on Long-Duration Contracts, Incurred Benefits	1,022	1,176
Liabilities for Guarantees on Long-Duration Contracts, Benefits Paid	(899)	(896)
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit or Estimated Gross Margin	74	(13)	96
Liabilities, as of Dec. 31	14,000	13,850	13,624
Reinsurance Recoverable, as of Dec. 31	4,756	4,659	4,316
Separate account liabilities	115,665	120,111
Net Amount at Risk by Product and Guarantee, Separate Account Value	78,740
Guaranteed Lifetime Withdrawal Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	6,400
Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Liabilities for Guarantees on Long-Duration Contracts, Other Liability Adjustments	(238)	(211)	(265)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	10,349	10,463	10,506
Reinsurance Recoverables on Unpaid Losses	56	107
Reinsurance Recoverable for Paid Claims and Claims Adjustments	(70)	(79)
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	507
Movement in Changes in gross GMDB/GMWB and UL secondary guarantee benefits [Roll Forward]
Liabilities, as of Jan. 1	10,674	10,771
Liabilities for Guarantees on Long-Duration Contracts, Incurred Benefits	671	741
Liabilities for Guarantees on Long-Duration Contracts, Benefits Paid	(785)	(784)
Liabilities, as of Dec. 31	10,587	10,674	10,771
Reinsurance Recoverable, as of Dec. 31	1,697	1,823	1,795
Return of Net Deposit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 8,766
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	69 years
Guaranteed Minimum Withdrawal Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	$ 0
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years
MAV Only [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 13,565
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years
Guaranteed Minimum Death Benefit [Member]
Separate Accounts Disclosure [Line Items]
Liabilities for Guarantees on Long-Duration Contracts, Other Liability Adjustments	$ 0	0	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	786	863	812
Reinsurance Recoverables on Unpaid Losses	0	132
Reinsurance Recoverable for Paid Claims and Claims Adjustments	(91)	(89)
Net Amount at Risk by Product and Guarantee, General Account Value	$ 3,773
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	70 years
Movement in Changes in gross GMDB/GMWB and UL secondary guarantee benefits [Roll Forward]
Liabilities, as of Jan. 1	$ 863	812
Liabilities for Guarantees on Long-Duration Contracts, Incurred Benefits	37	163
Liabilities for Guarantees on Long-Duration Contracts, Benefits Paid	(114)	(112)
Liabilities, as of Dec. 31	786	863	812
Reinsurance Recoverable, as of Dec. 31	432	523	480
Separate account liabilities	36,925
With Five Percent Rollup [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 1,156
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years
With Earnings Protection Benefit Rider (EPB) [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 3,436
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	70 years
With Five Percent Rollup and EPB [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 467
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	73 years
Asset Protection Benefit ("APB") [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 10,438
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	69 years
Lifetime Income Benefit ("LIB") - Death Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 464
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	70 years
Reset [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 2,406
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	70 years
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, General Account Value	$ 40,698
Universal Life [Member] | Secondary Guarantees [Member]
Separate Accounts Disclosure [Line Items]
Liabilities for Guarantees on Long-Duration Contracts, Other Liability Adjustments	0	0	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	2,627	2,313	2,041
Reinsurance Recoverables on Unpaid Losses	314	272
Movement in Changes in gross GMDB/GMWB and UL secondary guarantee benefits [Roll Forward]
Liabilities, as of Jan. 1	2,313	2,041
Liabilities for Guarantees on Long-Duration Contracts, Incurred Benefits	314	272
Liabilities, as of Dec. 31	2,627	2,313	2,041
Reinsurance Recoverable, as of Dec. 31	2,627	2,313	$ 2,041
Equity Securities [Member]
Separate Accounts Disclosure [Line Items]
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value	33,880	36,970
Cash and Cash Equivalents [Member]
Separate Accounts Disclosure [Line Items]
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value	3,045	$ 3,453
With Five Percent Rollup [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	187
With Five Percent Rollup [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	60
Return of Net Deposit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	69
Return of Net Deposit [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	65
With Five Percent Rollup and EPB [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	102
With Five Percent Rollup and EPB [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	22
Lifetime Income Benefit ("LIB") - Death Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	6
Lifetime Income Benefit ("LIB") - Death Benefit [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	6
MAV Only [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	2,285
MAV Only [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	350
Asset Protection Benefit ("APB") [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	172
Asset Protection Benefit ("APB") [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	114
Guaranteed Minimum Death Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	3,298
Guaranteed Minimum Death Benefit [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	704
With Earnings Protection Benefit Rider (EPB) [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	464
With Earnings Protection Benefit Rider (EPB) [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	75
Reset [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	13
Reset [Member] | Annuitization Benefit [Member]
Separate Accounts Disclosure [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk at Annuitization	$ 12