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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs Used in the Valuation of Available-for-sale Investments and Derivatives (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Available-for-sale Securities $ 59,433 $ 61,578
Asset derivatives 430 345
Total assets 62,459 63,964
Liabilities:    
Total liabilities 643 934
Unobservable Inputs    
Length of Volatility of Japanese Yen to US Dollar Exchange Rate 10 years 10 years
Fixed Maturities
    
Assets:    
Available-for-sale Securities 56,276 57,253
Perpetual Securities
    
Assets:    
Available-for-sale Securities 3,133 4,302
Equity Securities
    
Assets:    
Available-for-sale Securities 24 23
Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 954 1,031
Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 8,150 8,497
Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities 1,752 2,072
Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities 6,971 7,634
Banks/financial Institutions | Perpetual Securities
    
Assets:    
Available-for-sale Securities 2,915 3,950
Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities 24,394 23,827
Other Corporate | Perpetual Securities
    
Assets:    
Available-for-sale Securities 218 352
Interest rate swaps
    
Assets:    
Asset derivatives 26 32
Liabilities:    
Liability derivatives 1 3
Foreign currency swaps
    
Assets:    
Asset derivatives 381 311
Liabilities:    
Liability derivatives 314 329
Credit default swaps
    
Assets:    
Asset derivatives 2 2
Liabilities:    
Liability derivatives 56 67
Consensus Pricing Valuation Technique | Equity Securities
    
Assets:    
Available-for-sale Securities 4 4
Consensus Pricing Valuation Technique | Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 439 338
Consensus Pricing Valuation Technique | Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 25 25
Consensus Pricing Valuation Technique | Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities 332 495
Consensus Pricing Valuation Technique | Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities 26 797
Consensus Pricing Valuation Technique | Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities 138 412
Discounted Cash Flow Valuation Technique | Equity Securities
    
Assets:    
Available-for-sale Securities   6
Discounted Cash Flow Valuation Technique | Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities   11
Discounted Cash Flow Valuation Technique | Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities   3,328
Discounted Cash Flow Valuation Technique | Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities   1,037
Discounted Cash Flow Valuation Technique | Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities   2,580
Discounted Cash Flow Valuation Technique | Banks/financial Institutions | Perpetual Securities
    
Assets:    
Available-for-sale Securities   3,667
Discounted Cash Flow Valuation Technique | Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities   5,322
Discounted Cash Flow Valuation Technique | Other Corporate | Perpetual Securities
    
Assets:    
Available-for-sale Securities   352
Level 3
    
Assets:    
Available-for-sale Securities 469 3,405
Asset derivatives 158 191
Total assets 627 3,596
Liabilities:    
Total liabilities 371 399
Level 3 | Fixed Maturities
    
Assets:    
Available-for-sale Securities 465 3,186
Level 3 | Perpetual Securities
    
Assets:    
Available-for-sale Securities 0 215
Level 3 | Equity Securities
    
Assets:    
Available-for-sale Securities 4 4
Level 3 | Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 439 338
Level 3 | Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 420
Level 3 | Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 418
Level 3 | Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities 26 1,024
Level 3 | Banks/financial Institutions | Perpetual Securities
    
Assets:    
Available-for-sale Securities 0 215
Level 3 | Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 986
Level 3 | Other Corporate | Perpetual Securities
    
Assets:    
Available-for-sale Securities 0 0
Level 3 | Interest rate swaps
    
Assets:    
Asset derivatives 26 32
Liabilities:    
Liability derivatives 1 3
Level 3 | Foreign currency swaps
    
Assets:    
Asset derivatives 130 157
Liabilities:    
Liability derivatives 314 329
Level 3 | Credit default swaps
    
Assets:    
Asset derivatives 2 2
Liabilities:    
Liability derivatives 56 67
Level 3 | Consensus Pricing Valuation Technique | Equity Securities
    
Assets:    
Available-for-sale Securities 4 4
Level 3 | Consensus Pricing Valuation Technique | Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 439 338
Level 3 | Consensus Pricing Valuation Technique | Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 0
Level 3 | Consensus Pricing Valuation Technique | Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 0
Level 3 | Consensus Pricing Valuation Technique | Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities 26 580
Level 3 | Consensus Pricing Valuation Technique | Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities 0 411
Level 3 | Discounted Cash Flow Valuation Technique | Equity Securities
    
Assets:    
Available-for-sale Securities   0
Level 3 | Discounted Cash Flow Valuation Technique | Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Available-for-sale Securities   0
Level 3 | Discounted Cash Flow Valuation Technique | Public Utilities | Fixed Maturities
    
Assets:    
Available-for-sale Securities   420
Level 3 | Discounted Cash Flow Valuation Technique | Sovereign and Supranational | Fixed Maturities
    
Assets:    
Available-for-sale Securities   418
Level 3 | Discounted Cash Flow Valuation Technique | Banks/financial Institutions | Fixed Maturities
    
Assets:    
Available-for-sale Securities   444
Level 3 | Discounted Cash Flow Valuation Technique | Banks/financial Institutions | Perpetual Securities
    
Assets:    
Available-for-sale Securities   215
Level 3 | Discounted Cash Flow Valuation Technique | Other Corporate | Fixed Maturities
    
Assets:    
Available-for-sale Securities   575
Level 3 | Discounted Cash Flow Valuation Technique | Other Corporate | Perpetual Securities
    
Assets:    
Available-for-sale Securities   0
Level 3 | Discounted Cash Flow Valuation Technique | Interest rate swaps
    
Assets:    
Asset derivatives 26 32
Liabilities:    
Liability derivatives 1 3
Level 3 | Discounted Cash Flow Valuation Technique | Credit default swaps
    
Assets:    
Asset derivatives 2 2
Liabilities:    
Liability derivatives 56 67
Level 3 | Net Asset Value Valuation Technique | Equity Securities
    
Assets:    
Available-for-sale Securities 4 4
Level 3 | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Discounted Cash Flow Valuation Technique | Foreign currency swaps
    
Assets:    
Asset derivatives 35 51
Liabilities:    
Liability derivatives 114 118
Level 3 | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Discounted Cash Flow Valuation Technique | Foreign currency swaps
    
Assets:    
Asset derivatives 5 4
Liabilities:    
Liability derivatives 46 60
Level 3 | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Discounted Cash Flow Valuation Technique | Foreign currency swaps
    
Assets:    
Asset derivatives 90 102
Liabilities:    
Liability derivatives $ 154 $ 151
Level 3 | Liability | Lower Limit | Interest rate swaps
    
Unobservable Inputs    
Base correlation 45.00% [1] 49.00% [1]
CDS spreads 0.91% 0.91%
Level 3 | Liability | Lower Limit | Credit default swaps
    
Unobservable Inputs    
Base correlation 45.00% [1] 49.00% [1]
CDS spreads 0.91% 0.91%
Level 3 | Liability | Upper Limit | Interest rate swaps
    
Unobservable Inputs    
Base correlation 56.00% [1] 50.00% [1]
CDS spreads 1.43% 1.52%
Level 3 | Liability | Upper Limit | Credit default swaps
    
Unobservable Inputs    
Base correlation 56.00% [1] 50.00% [1]
CDS spreads 1.43% 1.52%
Level 3 | Liability | Weighted Average | Interest rate swaps
    
Unobservable Inputs    
Base correlation 50.00% [1]  
CDS spreads 1.20%  
Recovery rate 37.00% 37.00%
Level 3 | Liability | Weighted Average | Credit default swaps
    
Unobservable Inputs    
Base correlation 50.00% [1]  
CDS spreads 1.20%  
Recovery rate 37.00% 37.00%
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Foreign currency swaps
    
Unobservable Inputs    
Foreign exchange rates 21.10% [2] 20.65% [2]
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 0.35% 0.22%
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 1.57% 1.41%
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 0.19% 0.25%
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 2.04% 1.86%
Level 3 | Liability | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Foreign currency swaps
    
Unobservable Inputs    
Foreign exchange rates 21.10% [2] 20.65% [2]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Liability | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.05% [4]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.05% [4]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Liability | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.05% [4]
Level 3 | Assets | Public Utilities
    
Unobservable Inputs    
Fair Value Inputs, Volatility Rate   7.36%
Level 3 | Assets | Sovereign and Supranational
    
Unobservable Inputs    
Fair Value Inputs, Volatility Rate   7.36%
Level 3 | Assets | Banks/financial Institutions
    
Unobservable Inputs    
Fair Value Inputs, Volatility Rate   7.36%
Level 3 | Assets | Banks/financial Institutions | Perpetual Securities
    
Unobservable Inputs    
Fair Value Inputs, Volatility Rate   7.36%
Level 3 | Assets | Other Corporate
    
Unobservable Inputs    
Fair Value Inputs, Volatility Rate   7.36%
Level 3 | Assets | Lower Limit | Equity Securities
    
Unobservable Inputs    
Offered quotes (in dollars per share) $ 1 $ 2
Level 3 | Assets | Lower Limit | Interest rate swaps
    
Unobservable Inputs    
Base correlation 45.00% [1] 49.00% [1]
CDS spreads 0.91% 0.91%
Level 3 | Assets | Lower Limit | Credit default swaps
    
Unobservable Inputs    
Base correlation 45.00% 49.00%
CDS spreads 0.91% 0.91%
Level 3 | Assets | Upper Limit | Equity Securities
    
Unobservable Inputs    
Offered quotes (in dollars per share) $ 868 $ 943
Level 3 | Assets | Upper Limit | Interest rate swaps
    
Unobservable Inputs    
Base correlation 56.00% [1] 50.00% [1]
CDS spreads 1.43% 1.52%
Level 3 | Assets | Upper Limit | Credit default swaps
    
Unobservable Inputs    
Base correlation 56.00% 50.00%
CDS spreads 1.43% 1.52%
Level 3 | Assets | Weighted Average | Equity Securities
    
Unobservable Inputs    
Offered quotes (in dollars per share) $ 8 $ 8
Level 3 | Assets | Weighted Average | Interest rate swaps
    
Unobservable Inputs    
Base correlation 50.00% [1]  
CDS spreads 1.20%  
Recovery rate 37.00% 37.00%
Level 3 | Assets | Weighted Average | Credit default swaps
    
Unobservable Inputs    
Base correlation 50.00%  
CDS spreads 1.20%  
Recovery rate 37.00% 37.00%
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Foreign currency swaps
    
Unobservable Inputs    
Foreign exchange rates 21.10% [2] 20.65% [2]
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 0.22% 0.12%
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 1.29% 1.17%
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 0.15% 0.12%
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
CDS spreads 1.25% 1.26%
Level 3 | Assets | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Foreign currency swaps
    
Unobservable Inputs    
Foreign exchange rates 21.10% [2] 20.65% [2]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 2.01% [3] 1.84% [3]
Level 3 | Assets | United States of America, Dollars | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 3.02% [3] 2.84% [3]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.05% [4]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.84% [4]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Lower Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 0.69% [4] 0.84% [4]
Level 3 | Assets | Japan, Yen | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates [Member] | Upper Limit | Foreign currency swaps
    
Unobservable Inputs    
Interest rates 1.84% [4] 2.05% [4]
[1] Weighted-average range of base correlations for our bespoke tranches for attachment and detachment points corresponding to market indices
[2] Based on 10 year volatility of JPY/USD exchange rate
[3] Inputs derived from U.S. long-term rates to accommodate long maturity nature of our swaps
[4] Inputs derived from Japan long-term rates to accommodate long maturity nature of our swaps