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Investments (Net Unrealized Investment Gains and Losses on Fixed Maturity Securities on which an OTTI loss) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance $ 10,214 $ 5,245  
Accumulated Other Comprehensive Income (loss) [Member]
      
Balance 6,137 3,572 1,190
Net investment gains (losses) on investments arising during the period 6,213 4,693 4,400
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (179) (460) (243)
Reclassification adjustment for OTTI losses excluded from net income 61 [1] 36 [1] 30 [1]
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired (32) (272) (68)
Impact of net unrealized investment (gains) losses on future policy benefits 83 (240) (252)
Impact of net unrealized investment (gains) losses on policyholders' dividends (850) (1,192) (1,580)
Balance 11,433 6,137 3,572
Accumulated Other Comprehensive Income (loss) [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance (332) (327) (679)
Net investment gains (losses) on investments arising during the period 383 (308) (24)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 203 244 303
Reclassification adjustment for OTTI losses excluded from net income (60) [2] (36) [2] (28) [2]
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired (6) (3) (79)
Impact of net unrealized investment (gains) losses on future policy benefits (6) 12 (4)
Impact of net unrealized investment (gains) losses on policyholders' dividends (213) 86 218
Balance (31) (332) (327)
Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member]
      
Balance 15,748 [3] 9,261 [3] 2,885 [3]
Net investment gains (losses) on investments arising during the period 9,586 [3] 7,142 [3] 6,709 [3]
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (276) [3] (710) [3] (377) [3]
Reclassification adjustment for OTTI losses excluded from net income 93 [1],[3] 55 [1],[3] 44 [1],[3]
Balance 25,151 [3] 15,748 [3] 9,261 [3]
Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance (1,003) (849) (1,229)
Net investment gains (losses) on investments arising during the period 590 (474) (37)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 312 375 461
Reclassification adjustment for OTTI losses excluded from net income (93) [2] (55) [2] (44) [2]
Balance (194) (1,003) (849)
Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member]
      
Balance (1,179) (766) (803)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired (49) (413) (110)
Balance (1,228) (1,179) (766)
Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance 13 18 193
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired (10) (5) (123)
Balance 3 13 18
Future Policy Benefits, Pre Tax [Member]
      
Balance (1,270) (901) (509)
Impact of net unrealized investment (gains) losses on future policy benefits 126 (369) (392)
Balance (1,144) (1,270) (901)
Future Policy Benefits, Pre Tax [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance 14 (5) 2
Impact of net unrealized investment (gains) losses on future policy benefits (11) 19 (7)
Balance 3 14 (5)
Deferred Income Tax Liability Benefit [Member]
      
Balance (2,843) (1,568) (383)
Net investment gains (losses) on investments arising during the period (3,373) (2,449) (2,309)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 97 250 134
Reclassification adjustment for OTTI losses excluded from net income (32) [1] (19) [1] (14) [1]
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired 17 141 42
Impact of net unrealized investment (gains) losses on future policy benefits (43) 129 140
Impact of net unrealized investment (gains) losses on policyholders' dividends 458 673 874
Balance (5,719) (2,843) (1,568)
Deferred Income Tax Liability Benefit [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance 178 175 355
Net investment gains (losses) on investments arising during the period (207) 166 13
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (109) (131) (158)
Reclassification adjustment for OTTI losses excluded from net income 33 [2] 19 [2] 16 [2]
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, deferred sales inducements and valuation of business acquired 4 2 44
Impact of net unrealized investment (gains) losses on future policy benefits 5 (7) 3
Impact of net unrealized investment (gains) losses on policyholders' dividends 114 (46) (116)
Balance 18 178 175
Policyholders Dividends, Pre Tax [Member]
      
Balance (4,319) (2,454) 0
Impact of net unrealized investment (gains) losses on policyholders' dividends (1,308) (1,865) (2,454)
Balance (5,627) (4,319) (2,454)
Policyholders Dividends, Pre Tax [Member] | Securities Related to Other Than Temporary Impairments [Member]
      
Balance 466 334 0
Impact of net unrealized investment (gains) losses on policyholders' dividends (327) 132 334
Balance $ 139 $ 466 $ 334
[1] Represents “transfers out” related to the portion of OTTI losses recognized during the period that were not recognized in earnings for securities with no prior OTTI loss.
[2] Represents “transfers in” related to the portion of OTTI losses recognized during the period that were not recognized in earnings for securities with no prior OTTI loss.
[3] Includes cash flow hedges. See Note 21 for information on cash flow hedges.