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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Maturity 12 20 2012 [Member]
Dec. 31, 2012
Maturity 12 20 2016 [Member]
Dec. 31, 2011
Maturity 12 20 2016 [Member]
Dec. 31, 2012
Maturity 3 20 2017 [Member]
Dec. 31, 2011
Maturity 3 20 2017 [Member]
Dec. 31, 2012
A Minus Average Credit Rating [Member]
Dec. 31, 2011
A Minus Average Credit Rating [Member]
Dec. 31, 2012
A Average Credit Rating [Member]
Dec. 31, 2011
A Average Credit Rating [Member]
Dec. 31, 2012
AA [Member]
Dec. 31, 2011
AA [Member]
Dec. 31, 2012
AA- [Member]
Dec. 31, 2011
AA- [Member]
Dec. 31, 2012
A plus [Member]
Dec. 31, 2011
A plus [Member]
Dec. 31, 2012
External Credit Rating BBB [Member]
Dec. 31, 2011
External Credit Rating BBB [Member]
Dec. 31, 2009
Restatement Adjustment [Member]
Accounting Standards Update 2010-26 [Member]
Dec. 31, 2012
Unrealized Gain (Loss) on AFS Securities [Member]
Dec. 31, 2011
Unrealized Gain (Loss) on AFS Securities [Member]
Dec. 31, 2010
Unrealized Gain (Loss) on AFS Securities [Member]
Dec. 31, 2009
Unrealized Gain (Loss) on AFS Securities [Member]
Scenario, Previously Reported [Member]
Dec. 31, 2009
Unrealized Gain (Loss) on AFS Securities [Member]
Restatement Adjustment [Member]
Accounting Standards Update 2010-26 [Member]
Dec. 31, 2012
Unrealized Other Than Temporary Impairment on Available For Sale Securities [Member]
Dec. 31, 2011
Unrealized Other Than Temporary Impairment on Available For Sale Securities [Member]
Dec. 31, 2010
Unrealized Other Than Temporary Impairment on Available For Sale Securities [Member]
Dec. 31, 2009
Unrealized Other Than Temporary Impairment on Available For Sale Securities [Member]
Scenario, Previously Reported [Member]
Dec. 31, 2009
Unrealized Other Than Temporary Impairment on Available For Sale Securities [Member]
Restatement Adjustment [Member]
Accounting Standards Update 2010-26 [Member]
Dec. 31, 2012
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2011
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2009
Unrealized Gain (Loss) on Derivative Instruments [Member]
Scenario, Previously Reported [Member]
Dec. 31, 2009
Unrealized Gain (Loss) on Derivative Instruments [Member]
Restatement Adjustment [Member]
Accounting Standards Update 2010-26 [Member]
Dec. 31, 2012
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2011
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2010
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2009
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2012
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2011
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2010
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2009
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2012
Cash flow hedges [Member]
Dec. 31, 2011
Cash flow hedges [Member]
Dec. 31, 2010
Cash flow hedges [Member]
Dec. 31, 2012
Fair value hedges [Member]
Dec. 31, 2011
Fair value hedges [Member]
Dec. 31, 2010
Fair value hedges [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Cash flow hedges [Member]
Derivative investments [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Cash flow hedges [Member]
Derivative investments [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Fair value hedges [Member]
Interest expense [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Fair value hedges [Member]
Interest expense [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Fair value hedges [Member]
Interest expense [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Fair value hedges [Member]
Derivative investments [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Fair value hedges [Member]
Derivative investments [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Interest expense [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2011
Interest rate contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Net investment income [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Derivative investments [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Derivative investments [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2011
Foreign exchange contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2012
Equity contracts [Member]
Dec. 31, 2012
Equity contracts [Member]
Fair value hedges [Member]
Realized gain loss [Member]
Dec. 31, 2011
Equity contracts [Member]
Fair value hedges [Member]
Realized gain loss [Member]
Dec. 31, 2010
Equity contracts [Member]
Fair value hedges [Member]
Realized gain loss [Member]
Dec. 31, 2012
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Underwriting acquisition insurance and other expenses [Member]
Dec. 31, 2011
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Underwriting acquisition insurance and other expenses [Member]
Dec. 31, 2010
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Underwriting acquisition insurance and other expenses [Member]
Dec. 31, 2012
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2011
Equity contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2012
Equity collars [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2011
Equity collars [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2012
Credit Risk Contracts [Member]
Dec. 31, 2012
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2011
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Derivative investments [Member]
Dec. 31, 2012
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Other liabilities [Member]
Dec. 31, 2011
Credit Risk Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Other liabilities [Member]
Dec. 31, 2012
Indexed Annuity Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Indexed Annuity Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Indexed Annuity Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Indexed Annuity Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Future contract benefits [Member]
Dec. 31, 2011
Indexed Annuity Contracts [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Future contract benefits [Member]
Dec. 31, 2012
GLB Embedded Derivative Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
GLB Embedded Derivative Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
GLB Embedded Derivative Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
GLB Embedded Derivative Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Future contract benefits [Member]
Dec. 31, 2011
GLB Embedded Derivative Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Future contract benefits [Member]
Dec. 31, 2012
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2011
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2010
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Net investment income [Member]
Dec. 31, 2012
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2011
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Available For Sale Securities Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2012
Reinsurance related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2011
Reinsurance related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2010
Reinsurance related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Realized gain loss [Member]
Dec. 31, 2012
Reinsurance related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Reinsurance related embedded derivatives [Member]
Dec. 31, 2011
Reinsurance related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Reinsurance related embedded derivatives [Member]
Outstanding derivative instruments with off-balance-sheet risks                                                                                                                                                                                                                                                                                                            
Notional Amounts $ 61,110 $ 51,360                                                                                     $ 3,634 $ 2,852                 $ 3,214 $ 2,512                         $ 875 $ 1,675                         $ 36,539 $ 30,232         $ 420 $ 340                         $ 48 $ 4                     $ 19,857 $ 16,401 $ 9 $ 0               $ 0 $ 48 $ 148 $ 148       $ 0 $ 0       $ 0 $ 0                   $ 0 $ 0
Asset Carrying or Fair Value 3,547 3,950                                                                                     501 437                 462 385                         269 319                         1,042 1,041         39 52                         0 0                     1,734 2,153 1 0               0 0 0 0       0 0       0 0                   0 0
Liability Carrying or Fair Value 2,762 3,599                                                                                     250 269                 224 255                         0 0                         475 473         26 14                         0 0                     170 57 0 0               0 0 11 16       732 399       909 2,217                   215 168
Maturity of the notional amounts of derivative financial instruments                                                                                                                                                                                                                                                                                                            
Remaining Life Less Than 1 Year 13,550                                                                                                   2,834                                                                   48                                       10,668                           0                                                              
Remaining Life - 1 - 5 Years 25,188                                                                                                   20,828                                                                   205                                       4,007                           148                                                              
Remaining Life - 6 - 10 Years 11,266                                                                                                   5,901                                                                   200                                       5,165                           0                                                              
Remaining Life - 11 - 30 Years 9,890                                                                                                   9,852                                                                   15                                       23                           0                                                              
Remaining Life Over - 30 Years 1,216                                                                                                   1,213                                                                   0                                       3                           0                                                              
Remaining Life - Total Years 61,110                                                                                                   40,628                                                                   468                                       19,866                           148                                                              
Change in our unrealized gain on derivative instruments in accumulated OCI                                                                                                                                                                                                                                                                                                            
Balance as of beginning-of-year                                         3 2,947 1,176   49 2 (107) (109) (134) (115) (5) 119 (11)   11 3 (4) 1 1 3 (310) (278) (181) (210)                                                                                                                                                                                                                    
Cumulative Effect From Adoption Of New Accounting Standard Change     169                                                                                                                                                                                                                                                                                                      
Unrealized holding gains (losses) arising during the year                                                               55 184 (27)                                             73 177 (47)                       4 4 4                                   (22) 3 14                                                                                                   0 0 2          
Change in foreign currency exchange rate adjustment                                           14 (5) (6)               (12) 7 4                                                                                                                                                                                                                                        
Change in DAC, VOBA, DSI and DFEL                                                               15 0 0                                                                                                                                                                                                                                        
Income tax benefit (expense)                                                               (21) (67) 7                                                                                                                                                                                                                                        
Less: Reclassification adjustment for gains (losses) included in net income (loss)                                                               (15) (10) 14                                                   (1) (1) 4 (21) (15) 4                 4 4 4                                   3 2 2                                                                                                            
Less: Associated amortization of DAC, VOBA, DSI and DFEL                                                               4 1 0                                                                                                                                                                                                                                        
Less: Income tax benefit (expense)                                                               4 3 (5)                                                                                                                                                                                                                                        
Balance as of end-of-year                                         3 4,066 2,947 1,176 49 2 (107) (109) (134) (115) (5) 163 119 (11) 11 3 (4) 1 1 3 (310) (278) (181) (210)                                                                                                                                                                                                                    
Gains (losses) (187) (415) (106)                                                                                   (18) (13) 5 36 50 57   (22) (15) 3                       36 50 42                 (26) (44) 5 61 1,144 175       3 2 2                 0 0 43 (8) (12) (13)       0 0 15 (1,014) 316 (386) (345) 21 (118)           0 0 1 2 (7) 7         (136) 5 (81)     1,308 (1,809) 268     0 0 2       (47) (66) (71)    
Gains (losses) on derivative instruments designated as cash flow hedges                                                                                                                                                                                                                                                                                                            
Gain (loss) recognized as a component of other comprehensive income with the offset to net investment income (19) (13) 6                                                                                                                                                                                                                                                                                                      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 23                                                                                                                                                                                                                                                                                                          
Information related to fair value hedges                                                                                                                                                                                                                                                                                                            
Gain (loss) recognized as a component of OCI with the offset to interest expense 4 4 4                                                                                                                                                                                                                                                                                                      
Open credit default swap liabilities                                                                                                                                                                                                                                                                                                            
Credit rating of underlying obligation       BBB+ BBB- BBB+ BBB- BBB                                                                                                                                                                                                                                                                                            
Maturity date of open credit default swap liabilities       Dec. 20, 2012 Dec. 20, 2016 Dec. 20, 2016 Mar. 20, 2017 Mar. 20, 2017                                                                                                                                                                                                                                                                                            
Credit default swaps, number of instruments 7 9   4 3 3 4 2                                                                                                                                                                                                                                                                                            
Fair Value of open credit default swap liabilities (11) (16)   0 (4) (12) (7) (4)                                                                                                                                                                                                                                                                                            
Maximum potential payout of open credit default swap liabilities 149 148   40 68 68 81 40                                                                                                                                                                                                                                                                                            
Credit risk related contingent features collateral                                                                                                                                                                                                                                                                                                            
Maximum potential payout 149 148   40 68 68 81 40                                                                                                                                                                                                                                                                                            
Less: Counterparty thresholds 0 0                                                                                                                                                                                                                                                                                                        
Maximum collateral potentially required to post 149 148                                                                                                                                                                                                                                                                                                        
Collateral requirement if netting agreements not in place 11                                                                                                                                                                                                                                                                                                          
Nonperformance risk adjustment 2                                                                                                                                                                                                                                                                                                          
Exposure associated with collateralization events 15                                                                                                                                                                                                                                                                                                          
Collateral support agreements                                                                                                                                                                                                                                                                                                            
Collateral Posted by Counterparty (Held by LNC) 2,692 3,170             1,214 387 770 1,681 41 35 58 219 605 848 4 0                                                                                                                                                                                                                                                                    
Collateral Posted by LNC (Held by Counterparty) $ (68) $ (120)             $ 0 $ 0 $ (68) $ (120) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0