FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Available-for-sale Securities	$ 70,281	$ 61,038
Asset derivatives	541	488
Other Investments	4,001	463
Cash and cash equivalents	2,666	2,543
Total assets	77,489	64,532
Liabilities:
Liability derivatives	1,242	837
Total liabilities	1,242	837
Foreign currency swaps
Assets:
Asset derivatives	519	445
Liabilities:
Liability derivatives	189	218
Foreign currency forwards
Assets:
Asset derivatives	7	17
Liabilities:
Liability derivatives	979	582
Foreign currency options
Assets:
Asset derivatives	1	4
Liabilities:
Liability derivatives	8	1
Credit default swaps
Assets:
Asset derivatives		1
Liabilities:
Liability derivatives	1	4
Interest rate swaps
Assets:
Asset derivatives		1
Interest rate swaptions
Assets:
Asset derivatives	14	20
Liabilities:
Liability derivatives	65	32
Fixed Maturities
Assets:
Available-for-sale Securities	67,232	58,070
Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	20,023	15,432
Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	1,214	1,051
Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	637	771
Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	8,012	7,562
Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	1,494	1,523
Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	6,841	6,509
Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	29,011	25,222
Perpetual securities
Assets:
Available-for-sale Securities	3,026	2,947
Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	2,779	2,738
Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	247	209
Equity securities
Assets:
Available-for-sale Securities	23	21
Level 1
Assets:
Available-for-sale Securities	19,503	14,942
Asset derivatives	0	0
Other Investments	4,001	463
Cash and cash equivalents	2,666	2,543
Total assets	26,170	17,948
Liabilities:
Total liabilities	0	0
Level 1 | Foreign currency swaps
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 1 | Foreign currency forwards
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 1 | Foreign currency options
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 1 | Credit default swaps
Assets:
Asset derivatives		0
Liabilities:
Liability derivatives	0	0
Level 1 | Interest rate swaps
Assets:
Asset derivatives		0
Level 1 | Interest rate swaptions
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 1 | Fixed Maturities
Assets:
Available-for-sale Securities	19,489	14,928
Level 1 | Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	19,489	14,928
Level 1 | Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	0	0
Level 1 | Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	0	0
Level 1 | Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	0	0
Level 1 | Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	0	0
Level 1 | Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	0	0
Level 1 | Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	0	0
Level 1 | Perpetual securities
Assets:
Available-for-sale Securities	0	0
Level 1 | Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	0	0
Level 1 | Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	0	0
Level 1 | Equity securities
Assets:
Available-for-sale Securities	14	14
Level 2
Assets:
Available-for-sale Securities	50,505	45,649
Asset derivatives	443	382
Other Investments	0	0
Cash and cash equivalents	0	0
Total assets	50,948	46,031
Liabilities:
Total liabilities	1,052	630
Level 2 | Foreign currency swaps
Assets:
Asset derivatives	421	341
Liabilities:
Liability derivatives	0	15
Level 2 | Foreign currency forwards
Assets:
Asset derivatives	7	17
Liabilities:
Liability derivatives	979	582
Level 2 | Foreign currency options
Assets:
Asset derivatives	1	4
Liabilities:
Liability derivatives	8	1
Level 2 | Credit default swaps
Assets:
Asset derivatives		0
Liabilities:
Liability derivatives	0	0
Level 2 | Interest rate swaps
Assets:
Asset derivatives		0
Level 2 | Interest rate swaptions
Assets:
Asset derivatives	14	20
Liabilities:
Liability derivatives	65	32
Level 2 | Fixed Maturities
Assets:
Available-for-sale Securities	47,473	42,750
Level 2 | Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	534	504
Level 2 | Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	1,214	1,051
Level 2 | Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	392	402
Level 2 | Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	8,012	7,562
Level 2 | Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	1,494	1,523
Level 2 | Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	6,816	6,486
Level 2 | Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	29,011	25,222
Level 2 | Perpetual securities
Assets:
Available-for-sale Securities	3,026	2,895
Level 2 | Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	2,779	2,686
Level 2 | Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	247	209
Level 2 | Equity securities
Assets:
Available-for-sale Securities	6	4
Level 3
Assets:
Available-for-sale Securities	273	447
Asset derivatives	98	106
Other Investments	0	0
Cash and cash equivalents	0	0
Total assets	371	553
Liabilities:
Total liabilities	190	207
Level 3 | Foreign currency swaps
Assets:
Asset derivatives	98	104
Liabilities:
Liability derivatives	189	203
Level 3 | Foreign currency forwards
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 3 | Foreign currency options
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 3 | Credit default swaps
Assets:
Asset derivatives		1
Liabilities:
Liability derivatives	1	4
Level 3 | Interest rate swaps
Assets:
Asset derivatives		1
Level 3 | Interest rate swaptions
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives	0	0
Level 3 | Fixed Maturities
Assets:
Available-for-sale Securities	270	392
Level 3 | Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	0	0
Level 3 | Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	0	0
Level 3 | Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	245	369
Level 3 | Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	0	0
Level 3 | Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	0	0
Level 3 | Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	25	23
Level 3 | Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	0	0
Level 3 | Perpetual securities
Assets:
Available-for-sale Securities	0	52
Level 3 | Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	0	52
Level 3 | Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	0	0
Level 3 | Equity securities
Assets:
Available-for-sale Securities	$ 3	$ 3