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INVESTMENTS - Details of Holdings of Perpetual Securities (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Investment Holdings [Line Items] |  |
Amortized Cost | $ 64,399 | $ 59,515
Fair Value | 67,318 | 61,038
Unrealized Gain (Loss) | 2,919 | 1,523
Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 3,057 | 2,987
Fair Value | 3,016 | 2,947
Unrealized Gain (Loss) | (41) | (40)
Upper Tier II: | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 1,967 | 1,920
Fair Value | 1,965 | 1,913
Unrealized Gain (Loss) | (2) | (7)
Upper Tier II: | A | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 149 | 145
Fair Value | 185 | 183
Unrealized Gain (Loss) | 36 | 38
Upper Tier II: | BBB | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 1,601 | 1,563
Fair Value | 1,582 | 1,532
Unrealized Gain (Loss) | (19) | (31)
Upper Tier II: | BB or lower | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 217 | 212
Fair Value | 198 | 198
Unrealized Gain (Loss) | (19) | (14)
Tier I: | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 876 | 858
Fair Value | 822 | 825
Unrealized Gain (Loss) | (54) | (33)
Tier I: | BBB | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 764 | 746
Fair Value | 696 | 706
Unrealized Gain (Loss) | (68) | (40)
Tier I: | BB or lower | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 112 | 112
Fair Value | 126 | 119
Unrealized Gain (Loss) | 14 | 7
Other subordinated - non-banks | BB or lower | Perpetual securities: |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 214 | 209
Fair Value | 229 | 209
Unrealized Gain (Loss) | $ 15 | $ 0

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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