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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
Increase (decrease) in gross AFS securities unrealized losses | $ (228) |
Number of partnerships in alternative investment portfolio | item | 199 | 202
Alternative investments as a percentage of overall invested assets | 1.00% | 1.00%
Fair value of collateral received that we are permitted to sell or re-pledge | $ 176 |
Investment commitments | 1,300 |
Investment commitments for limited partnerships | 735 |
Investment commitments for mortgage loans on real estate | 340 |
Investment commitments for private placements | $ 228 |
California [Member] |  |
Largest mortgage loan concentration in geographic region | 20.00% | 20.00%
Texas [Member] |  |
Largest mortgage loan concentration in geographic region | 11.00% | 11.00%
Federal Home Loan Mortgage Corporation |  |
Fair value | $ 1,400 | $ 1,500
Concentration risk, percentage | 1.00% | 1.00%
Fannie Mae |  |
Fair value | $ 1,100 | $ 1,100
Concentration risk, percentage | 1.00% | 1.00%
Consumer Non-Cyclical Industry [Member] |  |
Fair value | $ 14,200 | $ 13,700
Concentration risk, percentage | 13.00% | 13.00%
Utilities Industry [Member] |  |
Fair value | $ 13,400 | $ 13,200
Concentration risk, percentage | 12.00% | 12.00%
Corporate bonds [Member] |  |
Percentage of fair value rated as investment grade | 96.00% | 95.00%
Amortized cost of portfolio rated below investment grade | $ 3,600 | $ 3,800
Fair value of portfolio rated below investment grade | $ 3,500 | $ 3,700
ABS [Member] |  |
Percentage of fair value rated as investment grade | 96.00% | 96.00%
Amortized cost of portfolio rated below investment grade | $ 87 | $ 91
Fair value of portfolio rated below investment grade | $ 74 | $ 75
MBS [Member] |  |
Projected default rate on existing delinquencies on MBS (low end of range) | 10.00% | 10.00%
Projected default rate on existing delinquencies on MBS (high end of range) | 100.00% | 100.00%
Severity of second lien loans | 100.00% | 100.00%
Severity of first lien loans | 30.00% | 30.00%

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