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Investments - Additional Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) security	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Concentration Risk [Line Items]
Net realized capital gains (losses)									$ 173,000,000	$ (83,000,000)	$ 29,000,000
AFS securities in an unrealized loss position | security	2,526								2,526
Percentage of AFS securities depressed less than 20% of cost or amortized cost	96.00%								96.00%
Mortgage loans	$ 3,175,000,000				$ 2,886,000,000				$ 3,175,000,000	2,886,000,000
LTV ratio	52.00%								52.00%
LTV ratio at origination	61.00%								61.00%
Servicing rights	$ 0				0				$ 0	0
Maximum exposure to loss for variable interest	$ 920,000,000				871,000,000				$ 920,000,000	871,000,000
Commitments for variable interest					701,000,000					701,000,000
Required collateral under securities lending	100.00%								100.00%
Fair value of securities on deposit	$ 2,500,000,000				2,500,000,000				$ 2,500,000,000	2,500,000,000
Equity method investments	1,200,000,000								1,200,000,000
Commitments to fund limited partnership and alternative investments	829,000,000								$ 829,000,000
Aggregate investment income from limited partnerships and other alternative investments									10.00%
Total assets	225,260,000,000				224,576,000,000				$ 225,260,000,000	224,576,000,000
Liabilities	211,766,000,000				207,673,000,000				211,766,000,000	207,673,000,000
Net investment income									1,603,000,000	1,577,000,000	1,561,000,000
Net income (loss)	(3,703,000,000)	$ 234,000,000	$ (40,000,000)	$ 378,000,000	(81,000,000)	$ 438,000,000	$ 216,000,000	$ 323,000,000	(3,131,000,000)	896,000,000	1,682,000,000
Limited Partner
Concentration Risk [Line Items]
Total assets	165,900,000,000				93,700,000,000				165,900,000,000	93,700,000,000
Liabilities	47,800,000,000				13,600,000,000				47,800,000,000	13,600,000,000
Net investment income									1,900,000,000	844,000,000	914,000,000
Net income (loss)									9,800,000,000	7,700,000,000	6,500,000,000
U.S. Treasuries
Concentration Risk [Line Items]
Pledged collateral	$ 104,000,000				102,000,000				$ 104,000,000	102,000,000
Minimum
Concentration Risk [Line Items]
Collateral provided by borrowers under securities lending	102.00%								102.00%
Percentage of fair value received at sale under repurchase agreements	95.00%								95.00%
Maximum
Concentration Risk [Line Items]
Collateral provided by borrowers under securities lending	105.00%								105.00%
Term of security lending agreement									90 days
Non-Consolidated VIE
Concentration Risk [Line Items]
Maximum exposure to loss for variable interest					3,000,000					3,000,000
Commitments for variable interest	$ 787,000,000								$ 787,000,000
Non-consolidated variable interest entities assets					1,000,000					1,000,000
Non-consolidated variable interest entities, liabilities					3,000,000					3,000,000
Commercial Loan
Concentration Risk [Line Items]
Loans serviced	1,300,000,000				901,000,000				1,300,000,000	901,000,000
Loans serviced on behalf of third parties	402,000,000				251,000,000				402,000,000	251,000,000
Held-for-sale
Concentration Risk [Line Items]
Mortgage loans					0					0
Valuation allowance
Concentration Risk [Line Items]
Mortgage loans	$ 24,000,000				0				$ 24,000,000	0
Commercial Loan
Concentration Risk [Line Items]
LTV ratio for which valuation allowance may be recorded for loans	90.00%								90.00%
Mortgage loans	$ 3,200,000,000				2,900,000,000				$ 3,200,000,000	2,900,000,000
Mortgage loans	3,175,000,000				2,886,000,000				3,175,000,000	2,886,000,000
Commercial Loan | Mortgage loans
Concentration Risk [Line Items]
Mortgage loans past due by 90 days or more	$ 0				$ 0				$ 0	$ 0
Municipal
Concentration Risk [Line Items]
Largest exposure by sector, percent of invested assets	28.00%				26.00%				28.00%	26.00%
CMBS
Concentration Risk [Line Items]
Largest exposure by sector, percent of invested assets	7.00%				7.00%				7.00%	7.00%
RMBS
Concentration Risk [Line Items]
Largest exposure by sector, percent of invested assets	7.00%				8.00%				7.00%	8.00%
States, municipalities and political subdivisions | New York State Dormitory Authority
Concentration Risk [Line Items]
Largest exposure by issuer, percent of invested assets (less than)	1.00%				1.00%				1.00%	1.00%
States, municipalities and political subdivisions | New York Transitional Authority
Concentration Risk [Line Items]
Largest exposure by issuer, percent of invested assets (less than)	1.00%								1.00%
States, municipalities and political subdivisions | Commonwealth Massachusetts
Concentration Risk [Line Items]
Largest exposure by issuer, percent of invested assets (less than)	1.00%				1.00%				1.00%	1.00%
Corporate | State of California
Concentration Risk [Line Items]
Largest exposure by issuer, percent of invested assets (less than)					1.00%					1.00%
CDOs
Concentration Risk [Line Items]
Consolidated variable interest entities assets					$ 5,000,000					$ 5,000,000
Consolidated variable interest entities liabilities					5,000,000					5,000,000
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Concentration Risk [Line Items]
Net realized capital gains (losses)									$ 152,000,000	36,000,000	(5,000,000)
Net income (loss)									202,000,000	86,000,000	$ (21,000,000)
Investments | Commercial Loan
Concentration Risk [Line Items]
Loans serviced on behalf of third parties, retained and reported as assets	$ 566,000,000				417,000,000				566,000,000	417,000,000
Assets Held for Sale | Commercial Loan
Concentration Risk [Line Items]
Loans serviced on behalf of third parties, retained and reported as assets	$ 0				$ 0				$ 0	$ 0

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