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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