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, 2012	Dec. 31, 2011
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	$ 61,578	$ 54,036
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,278	11,107
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	45,895	38,970
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,405	3,959
Fair Value, Measurements, Recurring | Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	57,253	47,572
Fair Value, Measurements, Recurring | Fixed Maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,265	11,092
Fair Value, Measurements, Recurring | Fixed Maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	41,802	33,051
Fair Value, Measurements, Recurring | Fixed Maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,186	3,429
Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,997	11,813
Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,265	11,092
Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	732	721
Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,195	1,159
Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,195	1,159
Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,031	1,338
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	693	944
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	338	394
Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	8,497	7,225
Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	8,077	6,803
Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	420	422
Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	2,072	2,308
Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,654	1,874
Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	418	434
Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	7,634	7,453
Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	6,610	6,379
Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,024	1,074
Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	23,827	16,276
Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	22,841	15,171
Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	986	1,105
Fair Value, Measurements, Recurring | Perpetual securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4,302	6,439
Fair Value, Measurements, Recurring | Perpetual securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Perpetual securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4,087	5,913
Fair Value, Measurements, Recurring | Perpetual securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	215	526
Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,950	6,078
Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,735	5,552
Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	215	526
Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	352	361
Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	352	361
Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	23	25
Fair Value, Measurements, Recurring | Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	13	15
Fair Value, Measurements, Recurring | Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	6	6
Fair Value, Measurements, Recurring | Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4	4
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,950	11,813
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	12,265	11,092
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	685	721
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,177	1,142
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,177	1,142
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	682	932
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	682	932
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	5,144	3,908
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	5,144	3,908
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	540	491
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	540	491
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4,257	3,612
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4,257	3,612
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	18,093	10,351
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	18,093	10,351
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	283	292
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	283	292
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	13	15
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	13	15
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Third party pricing vendor valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fixed Maturities | Public Utilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	420
Discounted cash flow valuation technique | Fixed Maturities | Sovereign and Supranational | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	418
Discounted cash flow valuation technique | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	444
Discounted cash flow valuation technique | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	575
Discounted cash flow valuation technique | Perpetual securities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	215
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	47
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	47
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	18	17
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	18	17
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	11	12
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	11	12
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,328	3,317
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	2,908	2,895
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	420	422
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1,037	1,817
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	619	1,383
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	418	434
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	2,580	3,274
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	2,136	2,722
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		552
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	5,322	5,368
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4,747	4,763
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		605
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,667	5,577
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	3,452	5,260
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	215	317
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	352	361
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	352	361
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	6	6
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	6	6
Discounted cash flow valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fixed Maturities | Mortgage- and asset-backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	338
Consensus pricing valuation technique | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	580
Consensus pricing valuation technique | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	411
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	338	394
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	338	394
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	25
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	25
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	495
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	495
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	797	567
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	217	45
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		522
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	412	557
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	1	57
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		500
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		209
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Perpetual securities | Banks/financial Institutions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities		209
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	4	4
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Consensus pricing valuation technique | Fair Value, Measurements, Recurring | Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale Securities	$ 4	$ 4