FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Available-for-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	$ 59,433	$ 61,578
Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	12,205	12,278
Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	46,759	45,895
Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	469	3,405
Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	56,276	57,253
Fixed Maturities | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	12,190	12,265
Fixed Maturities | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	43,621	41,802
Fixed Maturities | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	465	3,186
Perpetual Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	3,133	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	3,133	4,087
Perpetual Securities | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	0	215
Equity Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	24	23
Equity Securities | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	15	13
Equity Securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	5	6
Equity Securities | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	4	4
Equity Securities | Third party pricing vendor valuation technique [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	20	13
Equity Securities | Third party pricing vendor valuation technique [Member] | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	15	13
Equity Securities | Third party pricing vendor valuation technique [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	5	0
Equity Securities | Third party pricing vendor valuation technique [Member] | 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	4	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	4	4
Government and Agencies Debt Securities | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	12,894	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	12,190	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	704	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	12,894	12,950
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	12,190	12,265
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	704	685
Government and Agencies Debt Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	1,161	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	1,161	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	1,161	1,177
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	1,161	1,177
Municipalities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	954	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	515	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	439	338
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	515	682
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	515	682
Mortgage- and asset-backed Securities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	439	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	439	338
Public Utilities | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	8,150	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	8,150	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	8,125	5,144
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	8,125	5,144
Public Utilities | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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
Public Utilities | Fixed Maturities | Consensus Pricing Valuation Technique
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	25	25
Public Utilities | 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
Public Utilities | Fixed Maturities | Consensus Pricing Valuation Technique | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	25	25
Public Utilities | Fixed Maturities | Consensus Pricing 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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	1,752	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	1,752	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	1,420	540
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	1,420	540
Sovereign and Supranational | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	332	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	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	332	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	0
Banks/financial Institutions | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	6,971	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	6,945	6,610
Banks/financial Institutions | Fixed Maturities | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	26	1,024
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	6,945	4,257
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	6,945	4,257
Banks/financial Institutions | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	26	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	26	580
Banks/financial Institutions | Perpetual Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	2,915	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	2,915	3,735
Banks/financial Institutions | Perpetual Securities | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	0	215
Banks/financial Institutions | Perpetual Securities | Third party pricing vendor valuation technique [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	2,915	283
Banks/financial Institutions | Perpetual Securities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	2,915	283
Banks/financial Institutions | Perpetual Securities | Third party pricing vendor valuation technique [Member] | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	0	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
Other Corporate | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	24,394	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	24,394	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	24,256	18,093
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	24,256	18,093
Other Corporate | Fixed Maturities | Third party pricing vendor valuation technique [Member] | 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	138	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	138	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	218	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	218	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	218
Other Corporate | Perpetual Securities | Third party pricing vendor valuation technique [Member] | 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 [Member] | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale Securities	218
Other Corporate | Perpetual Securities | Third party pricing vendor valuation technique [Member] | 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