v3.8.0.1

Investments (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 0	$ 47,000,000
Net change in unrealized gains (losses) from trading account assets		300,000,000	75,000,000	$ (642,000,000)
Fixed maturities, available-for-sale:	[1]	346,780,000,000	321,419,000,000
Other trading accounts	[1]	5,752,000,000	5,764,000,000
Other long-term investments	[1]	12,308,000,000	11,283,000,000
Fair value of securities		5,126,000,000	7,185,000,000
Commercial mortgage and other loans, Acquired		0
Commercial mortgage and other loans, Sold		2,000,000	0
Troubled debt restructuring, Commitment to borrowers		0	0
Troubled debt restructuring, Private debt commitments		5,000,000
Consolidated feeder funds’ investments		451,000,000	216,000,000
Unaffiliated interest		310,000,000	93,000,000
Master funds gross assets		82,126,000,000	36,279,000,000
Master funds gross liabilities		79,185,000,000	34,880,000,000
Assets Deposited with Governmental Authorities		73,000,000	78,000,000
Restricted Cash and Investments		45,000,000	54,000,000
Assets Held in Voluntary Trusts		604,000,000	605,000,000
Other Restricted Assets Held-in-trust		3,500,000,000	3,300,000,000
Available-for-sale Securities, Restricted		59,000,000	89,000,000
Carrying value of non-income producing assets [Member]
Investment [Line Items]
Fixed maturities, available-for-sale:		111,000,000
Trading account assets supporting insurance liabilities		22,000,000
Other trading accounts		1,000,000
Other long-term investments		1,000,000
Investments
Investment [Line Items]
Fair value of securities		599,000,000	1,595,000,000
Cash
Investment [Line Items]
Fair value of securities		4,527,000,000	5,590,000,000
Fixed maturities
Investment [Line Items]
Gross unrealized losses		1,776,000,000	4,625,000,000
Gross unrealized losses of twelve months or more concentrated in various sectors		1,443,000,000	1,420,000,000
Fixed maturities, available-for-sale:		346,780,000,000	321,419,000,000
Fixed maturities | NAIC High or Highest Quality Rating
Investment [Line Items]
Gross unrealized losses		1,470,000,000	4,233,000,000
Fixed maturities | NAIC Other Than High or Highest Quality Rating
Investment [Line Items]
Gross unrealized losses		306,000,000	392,000,000
Corporate securities
Investment [Line Items]
Gross unrealized losses of twelve months or more concentrated in various sectors		1,443,000,000	1,420,000,000
Equity securities
Investment [Line Items]
Gross unrealized losses		29,000,000	42,000,000
Gross unrealized losses of twelve months or more concentrated in various sectors		1,000,000	1,000,000
Other trading account assets | Subtotal other trading account assets excluding derivative
Investment [Line Items]
Net change in unrealized gains (losses) from trading account assets		$ 256,000,000	164,000,000	$ (366,000,000)
California
Investment [Line Items]
Commercial mortgage loan, concentration percentage		27.00%
Texas
Investment [Line Items]
Commercial mortgage loan, concentration percentage		9.00%
NEW YORK
Investment [Line Items]
Commercial mortgage loan, concentration percentage		9.00%
Europe
Investment [Line Items]
Commercial mortgage loan, concentration percentage		6.00%
Asia
Investment [Line Items]
Commercial mortgage loan, concentration percentage		1.00%
Declines in Value of 20% or More | Equity securities
Investment [Line Items]
Gross unrealized losses		$ 8,000,000	9,000,000
Declines in Value of 20% or More and in loss position for less than six months | Equity securities
Investment [Line Items]
Gross unrealized losses		$ 5,000,000	$ 8,000,000
[1] See Note 5 for details of balances associated with variable interest entities.

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