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FAIR VALUE MEASUREMENTS - Estimated Effect of Potential Changes in Interest Rates, Credit Spreads and Interest Rate Volatility on Fair Values of Securities Priced by Discounted Cash Flow Pricing Model (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012
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Interest Rates |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Credit Spreads |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Interest Rate Volatility |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 50.00%
Available-for-Sale Fixed Maturity and Perpetual Securities | Interest Rates | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Change in fair value | (978)
Available-for-Sale Fixed Maturity and Perpetual Securities | Interest Rates | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (0.50%)
Change in fair value | 999
Available-for-Sale Fixed Maturity and Perpetual Securities | Credit Spreads | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Change in fair value | (975)
Available-for-Sale Fixed Maturity and Perpetual Securities | Credit Spreads | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (0.50%)
Change in fair value | 1,011
Available-for-Sale Fixed Maturity and Perpetual Securities | Interest Rate Volatility | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 50.00%
Change in fair value | (36)
Available-for-Sale Fixed Maturity and Perpetual Securities | Interest Rate Volatility | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (50.00%)
Change in fair value | 1
Held-to-maturity Securities | Interest Rates | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Change in fair value | (1,488)
Held-to-maturity Securities | Interest Rates | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (0.50%)
Change in fair value | 1,314
Held-to-maturity Securities | Credit Spreads | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 0.50%
Change in fair value | (1,379)
Held-to-maturity Securities | Credit Spreads | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (0.50%)
Change in fair value | 1,380
Held-to-maturity Securities | Interest Rate Volatility | Upward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | 50.00%
Change in fair value | (132)
Held-to-maturity Securities | Interest Rate Volatility | Downward Movements |
Discounted Cash Flow Pricing Model, by Assumption [Line Items] |
Factor Change | (50.00%)
Change in fair value | 167

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