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	Jun. 30, 2014	Dec. 31, 2013
Assets:
Available-for-sale Securities	$ 71,020	$ 61,038
Asset derivatives	591	488
Cash and cash equivalents	2,252	2,543
Total assets	73,863	64,069
Liabilities:
Liability derivatives	240	837
Total liabilities	240	837
Foreign currency swaps
Assets:
Asset derivatives	464	445
Liabilities:
Liability derivatives	156	218
Foreign currency forwards
Assets:
Asset derivatives	107	17
Liabilities:
Liability derivatives		582
Foreign currency options
Assets:
Asset derivatives	9	4
Liabilities:
Liability derivatives	7	1
Credit default swaps
Assets:
Asset derivatives		1
Liabilities:
Liability derivatives		4
Interest rate swaps
Assets:
Asset derivatives		1
Liabilities:
Liability derivatives	1
Interest rate swaptions
Assets:
Asset derivatives	11	20
Liabilities:
Liability derivatives	76	32
Fixed Maturities
Assets:
Available-for-sale Securities	67,829	58,070
Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	20,048	15,432
Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	1,159	1,051
Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	679	771
Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	8,166	7,562
Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	1,588	1,523
Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	7,066	6,509
Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	29,123	25,222
Perpetual securities
Assets:
Available-for-sale Securities	3,168	2,947
Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	2,911	2,738
Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	257	209
Equity securities
Assets:
Available-for-sale Securities	23	21
Level 1
Assets:
Available-for-sale Securities	19,499	14,942
Asset derivatives	0	0
Cash and cash equivalents	2,252	2,543
Total assets	21,751	17,485
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
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
Level 1 | Interest rate swaps
Assets:
Asset derivatives		0
Liabilities:
Liability 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	19,484	14,928
Level 1 | Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	19,484	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	15	14
Level 2
Assets:
Available-for-sale Securities	51,227	45,649
Asset derivatives	445	382
Cash and cash equivalents	0	0
Total assets	51,672	46,031
Liabilities:
Total liabilities	104	630
Level 2 | Foreign currency swaps
Assets:
Asset derivatives	318	341
Liabilities:
Liability derivatives	21	15
Level 2 | Foreign currency forwards
Assets:
Asset derivatives	107	17
Liabilities:
Liability derivatives		582
Level 2 | Foreign currency options
Assets:
Asset derivatives	9	4
Liabilities:
Liability derivatives	7	1
Level 2 | Credit default swaps
Assets:
Asset derivatives		0
Liabilities:
Liability derivatives		0
Level 2 | Interest rate swaps
Assets:
Asset derivatives		0
Liabilities:
Liability derivatives	0
Level 2 | Interest rate swaptions
Assets:
Asset derivatives	11	20
Liabilities:
Liability derivatives	76	32
Level 2 | Fixed Maturities
Assets:
Available-for-sale Securities	48,054	42,750
Level 2 | Fixed Maturities | Government and Agencies Debt Securities
Assets:
Available-for-sale Securities	564	504
Level 2 | Fixed Maturities | Municipalities
Assets:
Available-for-sale Securities	1,159	1,051
Level 2 | Fixed Maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale Securities	413	402
Level 2 | Fixed Maturities | Public Utilities
Assets:
Available-for-sale Securities	8,166	7,562
Level 2 | Fixed Maturities | Sovereign and supranational
Assets:
Available-for-sale Securities	1,588	1,523
Level 2 | Fixed Maturities | Banks/financial Institutions
Assets:
Available-for-sale Securities	7,041	6,486
Level 2 | Fixed Maturities | Other Corporate
Assets:
Available-for-sale Securities	29,123	25,222
Level 2 | Perpetual securities
Assets:
Available-for-sale Securities	3,168	2,895
Level 2 | Perpetual securities | Banks/financial Institutions
Assets:
Available-for-sale Securities	2,911	2,686
Level 2 | Perpetual securities | Other Corporate
Assets:
Available-for-sale Securities	257	209
Level 2 | Equity securities
Assets:
Available-for-sale Securities	5	4
Level 3
Assets:
Available-for-sale Securities	294	447
Asset derivatives	146	106
Cash and cash equivalents	0	0
Total assets	440	553
Liabilities:
Total liabilities	136	207
Level 3 | Foreign currency swaps
Assets:
Asset derivatives	146	104
Liabilities:
Liability derivatives	135	203
Level 3 | Foreign currency forwards
Assets:
Asset derivatives	0	0
Liabilities:
Liability derivatives		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		4
Level 3 | Interest rate swaps
Assets:
Asset derivatives		1
Liabilities:
Liability 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	291	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	266	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