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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Available-for-sale Securities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities $ 61,038 $ 61,578
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14,942 12,278
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 45,649 45,895
Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 447 3,405
Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 58,070 57,253
Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14,928 12,265
Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 42,750 41,802
Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 392 3,186
Perpetual securities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,947 4,302
Perpetual securities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Perpetual securities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,895 4,087
Perpetual securities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 52 215
Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 21 23
Equity securities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14 13
Equity securities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 4 6
Equity securities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 3 4
Equity securities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 18 13
Equity securities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14 13
Equity securities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 4 0
Equity securities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Equity securities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   6
Equity securities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Equity securities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   6
Equity securities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Equity securities | Consensus pricing valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 3 4
Equity securities | Consensus pricing valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Equity securities | Consensus pricing valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Equity securities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 3 4
Government and Agencies Debt Securities | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 15,432 12,997
Government and Agencies Debt Securities | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14,928 12,265
Government and Agencies Debt Securities | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 504 732
Government and Agencies Debt Securities | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 15,432 12,950
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 14,928 12,265
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 504 685
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Government and Agencies Debt Securities | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   47
Government and Agencies Debt Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Government and Agencies Debt Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   47
Government and Agencies Debt Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Municipalities | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,051 1,195
Municipalities | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Municipalities | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,051 1,195
Municipalities | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,051 1,177
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,051 1,177
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Municipalities | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   18
Municipalities | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Municipalities | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   18
Municipalities | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Mortgage- and asset-backed Securities | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 771 1,031
Mortgage- and asset-backed Securities | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage- and asset-backed Securities | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 402 693
Mortgage- and asset-backed Securities | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 369 338
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 402 682
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 402 682
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage- and asset-backed Securities | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   11
Mortgage- and asset-backed Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Mortgage- and asset-backed Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   11
Mortgage- and asset-backed Securities | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Mortgage- and asset-backed Securities | Fixed Maturities | Consensus pricing valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 369 338
Mortgage- and asset-backed Securities | Fixed Maturities | Consensus pricing valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage- and asset-backed Securities | Fixed Maturities | Consensus pricing valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage- and asset-backed Securities | Fixed Maturities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 369 338
Public Utilities | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 7,562 8,497
Public Utilities | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Public Utilities | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 7,562 8,077
Public Utilities | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 420
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 7,562 5,169
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 7,562 5,169
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Public Utilities | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   3,328
Public Utilities | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Public Utilities | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   2,908
Public Utilities | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   420
Sovereign and Supranational | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,523 2,072
Sovereign and Supranational | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Sovereign and Supranational | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,523 1,654
Sovereign and Supranational | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 418
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,523 540
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 1,523 540
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Sovereign and Supranational | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   1,037
Sovereign and Supranational | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Sovereign and Supranational | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   619
Sovereign and Supranational | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   418
Sovereign and Supranational | Fixed Maturities | Consensus pricing valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   495
Sovereign and Supranational | Fixed Maturities | Consensus pricing valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Sovereign and Supranational | Fixed Maturities | Consensus pricing valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   495
Sovereign and Supranational | Fixed Maturities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Banks/financial Institutions | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 6,509 7,634
Banks/financial Institutions | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 6,486 6,610
Banks/financial Institutions | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 23 1,024
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 6,486 4,257
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 6,486 4,257
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   2,580
Banks/financial Institutions | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Banks/financial Institutions | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   2,136
Banks/financial Institutions | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   444
Banks/financial Institutions | Fixed Maturities | Consensus pricing valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 23 797
Banks/financial Institutions | Fixed Maturities | Consensus pricing valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Fixed Maturities | Consensus pricing valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 217
Banks/financial Institutions | Fixed Maturities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 23 580
Banks/financial Institutions | Perpetual securities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,738 3,950
Banks/financial Institutions | Perpetual securities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Perpetual securities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,686 3,735
Banks/financial Institutions | Perpetual securities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 52 215
Banks/financial Institutions | Perpetual securities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,738 283
Banks/financial Institutions | Perpetual securities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Banks/financial Institutions | Perpetual securities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2,686 283
Banks/financial Institutions | Perpetual securities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 52 0
Banks/financial Institutions | Perpetual securities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   3,667
Banks/financial Institutions | Perpetual securities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Banks/financial Institutions | Perpetual securities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   3,452
Banks/financial Institutions | Perpetual securities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   215
Banks/financial Institutions | Perpetual securities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 52  
Other Corporate | Fixed Maturities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 25,222 23,827
Other Corporate | Fixed Maturities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Fixed Maturities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 25,222 22,841
Other Corporate | Fixed Maturities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 986
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 25,220 18,093
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 25,220 18,093
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Fixed Maturities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   5,322
Other Corporate | Fixed Maturities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Other Corporate | Fixed Maturities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   4,747
Other Corporate | Fixed Maturities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   575
Other Corporate | Fixed Maturities | Consensus pricing valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2 412
Other Corporate | Fixed Maturities | Consensus pricing valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Fixed Maturities | Consensus pricing valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 2 1
Other Corporate | Fixed Maturities | Consensus pricing valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 411
Other Corporate | Perpetual securities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 209 352
Other Corporate | Perpetual securities | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Perpetual securities | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 209 352
Other Corporate | Perpetual securities | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Corporate | Perpetual securities | Third party pricing vendor valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 209  
Other Corporate | Perpetual securities | Third party pricing vendor valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0  
Other Corporate | Perpetual securities | Third party pricing vendor valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 209  
Other Corporate | Perpetual securities | Third party pricing vendor valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities 0  
Other Corporate | Perpetual securities | Discounted cash flow valuation technique
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   352
Other Corporate | Perpetual securities | Discounted cash flow valuation technique | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   0
Other Corporate | Perpetual securities | Discounted cash flow valuation technique | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   352
Other Corporate | Perpetual securities | Discounted cash flow valuation technique | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale Securities   $ 0