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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 Investment by class [Member] | Jun. 30, 2011 Investment by class [Member] | Jun. 30, 2012 Investment by class [Member] | Jun. 30, 2011 Investment by class [Member] | Jun. 30, 2012 Derivatives by class [Member] | Jun. 30, 2011 Derivatives by class [Member] | Jun. 30, 2012 Derivatives by class [Member] | Jun. 30, 2011 Derivatives by class [Member] | Jun. 30, 2012 Other Asset Backed Securities [Member] Investment by class [Member] | Jun. 30, 2011 Other Asset Backed Securities [Member] Investment by class [Member] | Jun. 30, 2012 Other Asset Backed Securities [Member] Investment by class [Member] | Jun. 30, 2011 Other Asset Backed Securities [Member] Investment by class [Member] | Jun. 30, 2012 U.S. Agency Obligations [Member] Investment by class [Member] | Jun. 30, 2011 U.S. Agency Obligations [Member] Investment by class [Member] | Jun. 30, 2012 U.S. Agency Obligations [Member] Investment by class [Member] | Jun. 30, 2011 U.S. Agency Obligations [Member] Investment by class [Member] | Jun. 30, 2012 Collateralized debt obligations [Member] Investment by class [Member] | Jun. 30, 2011 Collateralized debt obligations [Member] Investment by class [Member] | Jun. 30, 2012 Collateralized debt obligations [Member] Investment by class [Member] | Jun. 30, 2011 Collateralized debt obligations [Member] Investment by class [Member] | Jun. 30, 2012 Corporate obligations [Member] Investment by class [Member] | Jun. 30, 2011 Corporate obligations [Member] Investment by class [Member] | Jun. 30, 2012 Corporate obligations [Member] Investment by class [Member] | Jun. 30, 2011 Corporate obligations [Member] Investment by class [Member] | Jun. 30, 2012 Interest rate swaps [Member] Derivatives by class [Member] | Jun. 30, 2011 Interest rate swaps [Member] Derivatives by class [Member] | Jun. 30, 2012 Interest rate swaps [Member] Derivatives by class [Member] | Jun. 30, 2011 Interest rate swaps [Member] Derivatives by class [Member] | Jun. 30, 2012 Credit Derivative [Member] Derivatives by class [Member] | Jun. 30, 2011 Credit Derivative [Member] Derivatives by class [Member] | Jun. 30, 2012 Credit Derivative [Member] Derivatives by class [Member] | Jun. 30, 2011 Credit Derivative [Member] Derivatives by class [Member] | Jun. 30, 2012 Call Option on Long Term Debt [Member] Derivatives by class [Member] | Jun. 30, 2011 Call Option on Long Term Debt [Member] Derivatives by class [Member] | Jun. 30, 2012 Call Option on Long Term Debt [Member] Derivatives by class [Member] | Jun. 30, 2011 Call Option on Long Term Debt [Member] Derivatives by class [Member] | Jun. 30, 2012 Variable Interest Entity [Member] | Jun. 30, 2011 Variable Interest Entity [Member] | Jun. 30, 2012 Variable Interest Entity [Member] | Jun. 30, 2011 Variable Interest Entity [Member] | Jun. 30, 2012 Investments contract [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Investments contract [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Investments contract [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Investments contract [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Loan [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Loan [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Loan [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Loan [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Derivatives Liability [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Derivatives Liability [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Derivatives Liability [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Derivatives Liability [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Long-term Debt [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Long-term Debt [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Long-term Debt [Member] Variable Interest Entity [Member] | Jun. 30, 2011 Long-term Debt [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Investments [Member] | Jun. 30, 2011 Investments [Member] | Jun. 30, 2012 Investments [Member] | Jun. 30, 2011 Investments [Member] | Jun. 30, 2012 Other Assets [Member] | Jun. 30, 2011 Other Assets [Member] | Jun. 30, 2012 Other Assets [Member] | Jun. 30, 2011 Other Assets [Member] | Dec. 31, 2010 Other Assets [Member] Variable Interest Entity [Member] | Jun. 30, 2012 Derivatives Assets [Member] | Jun. 30, 2011 Derivatives Assets [Member] | Jun. 30, 2012 Derivatives Assets [Member] | Jun. 30, 2011 Derivatives Assets [Member]
Summary of changes in the Level 3 fair value category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 161,450 | $ 200,076 | $ 97,522 | $ 199,172 | $ (355,616) | $ (189,614) | $ (486,775) | $ (195,934) | $ 137,026 | $ 160,927 | $ 75,886 | $ 159,473 | $ 1,218 | $ 1,186 | $ 1,224 | $ 1,197 | $ 9,839 | $ 30,027 | $ 12,482 | $ 30,433 | $ 13,367 | $ 7,936 | $ 7,930 | $ 8,069 | $ (222,222) | $ 29,571 | $ (302,177) | $ 25,750 | $ (201,129) | $ (235,910) | $ (190,653) | $ (221,684) | $ 67,735 | $ 16,725 | $ 6,055 |  | $ 13,679,955 | $ 14,173,322 | $ 14,019,216 | $ 15,874,571 | $ 2,184,665 | $ 1,929,691 | $ 2,199,338 | $ 1,904,361 | $ 14,460,077 | $ 14,086,858 | $ 14,126,994 | $ 15,800,918 |  |  |  | $ 4,511 | $ (2,786,644) | $ (1,872,694) | $ (1,934,642) | $ (1,856,366) | $ 161,450 | $ 200,076 | $ 97,522 | $ 199,172 | $ 16,023 | $ 19,005 | $ 16,779 |  | $ 17,909 | $ (355,616) | $ (189,614) | $ (486,775) | $ (195,934)
Additions of VIEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (350,624) |  | (350,624) |  |  |  |  |  |  |  |  |  |  |  |  |  | (350,624) |  | (350,624) |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains/(losses) realized and unrealized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings | 88 | (3,321) | 40 | (3,371) | (81,290) | (47,923) | 41,037 | (30,278) |  |  |  |  | (2) | (2) | (2) | (3) |  | (3,276) | (2) | (3,282) | 90 | (43) | 44 | (86) | (112,904) | (76,255) | (45,035) | (66,432) | (7,416) | 24,287 | (14,638) | 15,384 | 39,030 | 4,045 | 100,710 | 20,770 | 91,712 | 322,535 | 160,521 | 279,360 | 20,103 | 93,433 | (62,713) | 64,589 | 131,807 | 402,698 | 298,472 | 355,316 |  |  |  | (4,511) | 21,235 | (121,798) | (115,328) | (102,927) | 88 | (3,321) | 40 | (3,371) | (231) | (554) | (987) | 542 |  | (81,290) | (47,923) | 41,037 | (30,278)
Included in other comprehensive income | (1,588) | 4,686 | 6,225 | 7,909 |  |  |  |  | (1,696) | (403) | 6,376 | 1,787 | (3) | 13 | (9) | 3 | 190 | 5,001 | 291 | 6,134 | (79) | 75 | (433) | (15) |  |  |  |  |  |  |  |  |  |  |  |  | (256,974) | 10,346 | 171,634 | 450,301 | (42,706) | 389 | 25,437 | 54,563 | (267,190) | 5,765 | 148,667 | 440,520 |  |  |  |  | 54,510 | (494) | (8,695) | (52,691) | (1,588) | 4,686 | 6,225 | 7,909 |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | (16,600) |  | (16,600) |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,600) |  | (16,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,600) |  | (16,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,600) |  | (16,600) |  |  |  |  |  |  |  |  |
Settlements | (89,879) | (1,408) | (92,621) | (3,677) | (70,698) | (24,750) | (61,866) | (36,075) | (84,584) | (756) | (84,584) | (1,492) | (749) | (213) | (749) | (213) | (471) | (439) | (3,213) | (1,972) | (4,075) |  | (4,075) |  | 39,139 | (20,526) | 51,225 | (26,528) | (3,072) | (4,224) | (6,326) | (9,547) | (106,765) |  | (106,765) |  | (227,135) | (61,236) | (457,454) | (271,279) |  |  |  |  | (86,421) | (52,409) | (335,860) | (258,875) |  |  |  |  | 19,863 | 17,331 | 32,893 | 27,348 | (89,879) | (1,408) | (92,621) | (3,677) |  |  |  |  |  | (70,698) | (24,750) | (61,866) | (36,075)
Transfers in Level 3 |  |  | 58,905 |  |  |  |  |  |  |  | 53,068 |  |  |  |  |  |  |  |  |  |  |  | 5,837 |  |  |  |  |  |  |  |  |  |  |  |  |  | (312,083) | (206,015) | (918,442) | (256,140) |  |  |  |  |  |  |  |  |  |  |  |  | (312,083) | (206,015) | (977,347) | (256,140) |  |  | 58,905 |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 | (6,301) |  | (6,301) |  |  |  |  |  |  |  |  |  | (464) |  | (464) |  |  |  |  |  | (5,837) |  | (5,837) |  |  |  |  |  |  |  |  |  |  |  |  |  | 650,758 | 223,322 | 650,758 | 280,428 |  |  |  |  |  |  |  |  |  |  |  |  | 657,059 | 223,322 | 657,059 | 280,428 | (6,301) |  | (6,301) |  |  |  |  |  |  |  |  |  |
Deconsolidation of VIEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,894,967) |  |  |  |  |  |  |  | (1,894,967) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, end of period | 63,770 | 183,433 | 63,770 | 183,433 | (507,604) | (262,287) | (507,604) | (262,287) | 50,746 | 159,768 | 50,746 | 159,768 |  | 984 |  | 984 | 9,558 | 14,713 | 9,558 | 14,713 | 3,466 | 7,968 | 3,466 | 7,968 | (295,987) | (67,210) | (295,987) | (67,210) | (211,617) | (215,847) | (211,617) | (215,847) |  | 20,770 |  | 20,770 | 13,626,233 | 14,095,050 | 13,626,233 | 14,095,050 | 2,162,062 | 2,023,513 | 2,162,062 | 2,023,513 | 14,238,273 | 14,442,912 | 14,238,273 | 14,442,912 |  | 0 |  | 0 | (2,346,060) | (2,310,972) | (2,346,060) | (2,310,972) | 63,770 | 183,433 | 63,770 | 183,433 | 15,792 | 18,451 | 15,792 | 18,451 | 17,909 | (507,604) | (262,287) | (507,604) | (262,287)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date |  |  |  |  | $ (118,474) | $ (61,643) | $ (72,910) | $ (48,301) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (107,861) | $ (83,407) | $ (46,263) | $ (69,607) | $ (10,613) | $ 17,719 | $ (26,647) | $ 536 |  | $ 4,045 |  | $ 20,770 | $ 54,440 | $ 312,136 | $ 47,015 | $ 264,708 | $ 20,103 | $ 93,433 | $ (62,713) | $ 64,589 | $ 131,807 | $ 402,698 | $ 298,953 | $ 355,316 |  |  |  | $ (4,511) | $ 21,235 | $ (121,798) | $ (115,328) | $ (102,927) |  |  |  |  | $ (231) | $ (554) | $ (987) | $ 542 |  | $ (118,474) | $ (61,643) | $ (72,910) | $ (48,301)

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