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Derivatives (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 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 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 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Jun. 30, 2011
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Dec. 31, 2010
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Fair value hedges [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Fair value hedges [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Fair value hedges [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Fair value hedges [Member]
Dec. 31, 2010
Interest rate swap agreements [Member]
Fair value hedges [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Fair value hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Interest rate swap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate swap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Interest rate swap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Foreign currency swaps [Member]
Jun. 30, 2010
Foreign currency swaps [Member]
Jun. 30, 2011
Foreign currency swaps [Member]
Jun. 30, 2010
Foreign currency swaps [Member]
Jun. 30, 2011
Foreign currency swaps [Member]
Cash flow hedges [Member]
Jun. 30, 2010
Foreign currency swaps [Member]
Cash flow hedges [Member]
Dec. 31, 2010
Foreign currency swaps [Member]
Cash flow hedges [Member]
Jun. 30, 2011
Foreign currency swaps [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Foreign currency swaps [Member]
Cash flow hedges [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Reverse Treasury Locks [Member]
Dec. 31, 2010
Cash flow hedges [Member]
Reverse Treasury Locks [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Forward starting interest rate swaps [Member]
Dec. 31, 2010
Cash flow hedges [Member]
Forward starting interest rate swaps [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Forward starting interest rate swaps [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Cash flow hedges [Member]
Forward starting interest rate swaps [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Treasury locks [Member]
Jun. 30, 2010
Cash flow hedges [Member]
Treasury locks [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Treasury locks [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Cash flow hedges [Member]
Treasury locks [Member]
Unrealized Gain (Loss) on Derivative Instruments [Member]
Dec. 31, 2010
Interest rate cap agreements [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Interest rate futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Interest rate futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Interest rate futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Equity futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Equity futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Equity futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Equity futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Equity futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Foreign currency forwards [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Foreign currency forwards [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Foreign currency forwards [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Foreign currency forwards [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Credit default swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Credit default swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Credit default swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Credit default swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Credit default swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Credit Default Swaps Fees [Members]
Jun. 30, 2010
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Credit Default Swaps Fees [Members]
Jun. 30, 2011
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Credit Default Swaps Fees [Members]
Jun. 30, 2010
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Credit Default Swaps Fees [Members]
Jun. 30, 2011
Total return swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Total return swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Total return swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Total return swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Total return swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Put options [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Put options [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Put options [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Put options [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Put options [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Call options (based on S and P 500) [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Call options (based on S and P 500) [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Call options (based on S and P 500) [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Call options (based on S and P 500) [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Call options (based on S and P 500) [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Variance swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Variance swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Variance swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Variance swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Variance swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Currency futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Currency futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Currency futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Currency futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Currency futures [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Consumer price index swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Consumer price index swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Consumer price index swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Consumer price index swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Consumer price index swaps [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Interest rate cap corridors [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate cap corridors [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Interest rate cap corridors [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Interest rate cap corridors [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Interest rate cap corridors [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Deferred Compensation Plans [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Deferred Compensation Plans [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Deferred Compensation Plans [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Deferred Compensation Plans [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Deferred Compensation Plans [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Indexed Annuity Contracts Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Indexed Annuity Contracts Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Indexed Annuity Contracts Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Indexed Annuity Contracts Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Indexed Annuity Contracts Embedded Derivatives [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
GLB Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
GLB Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
GLB Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
GLB Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
GLB Reserves [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Reinsurance Related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Reinsurance Related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Reinsurance Related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Reinsurance Related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Reinsurance Related [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
AFS Securities [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
AFS Securities [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
AFS Securities [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
AFS Securities [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
AFS Securities [Member]
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Designated [Member]
Jun. 30, 2010
Designated [Member]
Jun. 30, 2011
Designated [Member]
Jun. 30, 2010
Designated [Member]
Dec. 31, 2010
Designated [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Jun. 30, 2010
Cash flow hedges [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Jun. 30, 2010
Cash flow hedges [Member]
Dec. 31, 2010
Cash flow hedges [Member]
Jun. 30, 2011
Fair value hedges [Member]
Jun. 30, 2010
Fair value hedges [Member]
Jun. 30, 2011
Fair value hedges [Member]
Jun. 30, 2010
Fair value hedges [Member]
Dec. 31, 2010
Fair value hedges [Member]
Jun. 30, 2011
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2010
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Dec. 31, 2010
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Jun. 30, 2011
Unrealized Gain (Loss) on AFS Securities [Member]
Jun. 30, 2010
Unrealized Gain (Loss) on AFS Securities [Member]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 2011
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2010
Unrealized Gain (Loss) on Derivative Instruments [Member]
Jun. 30, 2011
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2010
Foreign Currency Translation Adjustment [Member]
Jun. 30, 2010
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2009
Foreign Currency Translation Adjustment [Member]
Jun. 30, 2011
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2010
Funded Status of Employee Benefit Plans [Member]
Jun. 30, 2010
Funded Status of Employee Benefit Plans [Member]
Dec. 31, 2009
Funded Status of Employee Benefit Plans [Member]
Jun. 30, 2011
AAA
Dec. 31, 2010
AAA
Jun. 30, 2011
AA
Dec. 31, 2010
AA
Jun. 30, 2011
AA-
Dec. 31, 2010
AA-
Jun. 30, 2011
A plus
Dec. 31, 2010
A plus
Jun. 30, 2011
A
Dec. 31, 2010
A
Jun. 30, 2011
Maturity 12 20 2012 [Member]
Dec. 31, 2010
Maturity 12 20 2012 [Member]
Jun. 30, 2011
Maturity 12 20 2016 [Member]
Dec. 31, 2010
Maturity 12 20 2016 [Member]
Jun. 30, 2011
Maturity 3 20 2017 [Member]
Dec. 31, 2010
Maturity 3 20 2017 [Member]
Outstanding derivative instruments with off-balance-sheet risks                                                                                                                                                                                                                                                                                                                                                                      
Number of Instruments 484,605   484,605   470,270 150   150   151     11   11   11     94   94   81         13   13     10 5 1 2             3 9,796   9,796   15,881 9,638   9,638   13,375         8   8   9         12   12   9 169   169   145 539   539   544 45   45   50 29   29   1,589 98   98   100 79   79   73 6   6   6 141,509   141,509   132,260 322,398   322,398   305,962 0   0   0         1 185   185   182 174   174   171 11   11   11 484,420   484,420   470,088                                                                
Notional Amounts $ 35,880,000,000   $ 35,880,000,000   $ 34,438,000,000 $ 901,000,000   $ 901,000,000   $ 926,000,000     $ 1,675,000,000   $ 1,675,000,000   $ 1,675,000,000     $ 8,880,000,000   $ 8,880,000,000   $ 7,955,000,000         $ 340,000,000   $ 340,000,000     $ 1,300,000,000 $ 1,000,000,000 $ 39,000,000 $ 150,000,000             $ 150,000,000 $ 1,617,000,000   $ 1,617,000,000   $ 2,251,000,000 $ 726,000,000   $ 726,000,000   $ 907,000,000         $ 125,000,000   $ 125,000,000   $ 145,000,000         $ 915,000,000   $ 915,000,000   $ 900,000,000 $ 6,352,000,000   $ 6,352,000,000   $ 5,602,000,000 $ 4,552,000,000   $ 4,552,000,000   $ 4,083,000,000 $ 28,000,000   $ 28,000,000   $ 30,000,000 $ 4,000,000   $ 4,000,000   $ 219,000,000 $ 51,000,000   $ 51,000,000   $ 55,000,000 $ 8,375,000,000   $ 8,375,000,000   $ 8,050,000,000 $ 0   $ 0   $ 0 $ 0   $ 0   $ 0 $ 0   $ 0   $ 0 $ 0   $ 0   $ 0         $ 0 $ 4,255,000,000   $ 4,255,000,000   $ 4,091,000,000 $ 2,580,000,000   $ 2,580,000,000   $ 2,416,000,000 $ 1,675,000,000   $ 1,675,000,000   $ 1,675,000,000 $ 31,625,000,000   $ 31,625,000,000   $ 30,347,000,000                                                                
Asset Carrying or Fair Value Gain 1,813,000,000   1,813,000,000   1,784,000,000 24,000,000   24,000,000   24,000,000     120,000,000   120,000,000   106,000,000     52,000,000   52,000,000   34,000,000         41,000,000   43,000,000     0 11,000,000 0 1,000,000             0 0   0   0 0   0   0         0   0   0         1,000,000   1,000,000   0 1,219,000,000   1,219,000,000   1,151,000,000 293,000,000   293,000,000   301,000,000 24,000,000   24,000,000   46,000,000 0   0   0 1,000,000   1,000,000   0 38,000,000   38,000,000   52,000,000 0   0   0 0   0   0 0   0   0 0   0   0         15,000,000 185,000,000   185,000,000   185,000,000 65,000,000   65,000,000   79,000,000 120,000,000   120,000,000   106,000,000 1,628,000,000   1,628,000,000   1,599,000,000                                                                
Asset Carrying or Fair Value Loss (716,000,000)   (716,000,000)   (708,000,000) (85,000,000)   (85,000,000)   (71,000,000)     (37,000,000)   (37,000,000)   (51,000,000)     (494,000,000)   (494,000,000)   (511,000,000)         (20,000,000)   (13,000,000)     (33,000,000) (5,000,000) (1,000,000) 0             0 0   0   0 0   0   0         0   0   0         (7,000,000)   (7,000,000)   (21,000,000) 0   0   0 0   0   0 (38,000,000)   (38,000,000)   (34,000,000) 0   0   0 (1,000,000)   (1,000,000)   (2,000,000) 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0         0 (176,000,000)   (176,000,000)   (140,000,000) (139,000,000)   (139,000,000)   (89,000,000) (37,000,000)   (37,000,000)   (51,000,000) (540,000,000)   (540,000,000)   (568,000,000)                                                                
Liability Carrying or Fair Value Gain 595,000,000   595,000,000   518,000,000 0   0   0     0   0   0     0   0   0         0   0     0 0 0 0             0 0   0   0 0   0   0         0   0   0         0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 595,000,000   595,000,000   518,000,000 0   0   0         0 0   0   0 0   0   0 0   0   0 595,000,000   595,000,000   518,000,000                                                                
Liability Carrying or Fair Value Loss (1,948,000,000)   (1,948,000,000)   (1,959,000,000) 0   0   0     (83,000,000)   (83,000,000)   (55,000,000)     0   0   0         0   0     0 0 0 0             0 0   0   0 0   0   0         (7,000,000)   (7,000,000)   (16,000,000)         0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 0   0   0 (360,000,000)   (360,000,000)   (363,000,000) (506,000,000)   (506,000,000)   (497,000,000) (873,000,000)   (873,000,000)   (926,000,000) (119,000,000)   (119,000,000)   (102,000,000)         0 (83,000,000)   (83,000,000)   (55,000,000) 0   0   0 (83,000,000)   (83,000,000)   (55,000,000) (1,865,000,000)   (1,865,000,000)   (1,904,000,000)                                                                
Maturity of the notional amounts of derivative financial instruments                                                                                                                                                                                                                                                                                                                                                                      
Remaining Life Less Than 1 Year 7,048,000,000   7,048,000,000     24,000,000   24,000,000         0   0         400,000,000   400,000,000             0         0   0                 1,617,000,000   1,617,000,000     726,000,000   726,000,000             0   0             615,000,000   615,000,000     0   0     3,658,000,000   3,658,000,000     0   0     4,000,000   4,000,000     4,000,000   4,000,000     0   0                                                       24,000,000   24,000,000     24,000,000   24,000,000     0   0     7,024,000,000   7,024,000,000                                                                    
Remaining Life - 1 - 5 Years 11,590,000,000   11,590,000,000     59,000,000   59,000,000         800,000,000   800,000,000         1,561,000,000   1,561,000,000             124,000,000         1,030,000,000   0                 0   0     0   0             40,000,000   40,000,000             300,000,000   300,000,000     1,664,000,000   1,664,000,000     894,000,000   894,000,000     3,000,000   3,000,000     0   0     15,000,000   15,000,000     5,100,000,000   5,100,000,000                                                       2,013,000,000   2,013,000,000     1,213,000,000   1,213,000,000     800,000,000   800,000,000     9,577,000,000   9,577,000,000                                                                    
Remaining Life - 6 - 10 Years 10,908,000,000   10,908,000,000     264,000,000   264,000,000         0   0         2,114,000,000   2,114,000,000             135,000,000         270,000,000   39,000,000                 0   0     0   0             85,000,000   85,000,000             0   0     4,688,000,000   4,688,000,000     0   0     25,000,000   25,000,000     0   0     13,000,000   13,000,000     3,275,000,000   3,275,000,000                                                       708,000,000   708,000,000     708,000,000   708,000,000     0   0     10,200,000,000   10,200,000,000                                                                    
Remaining Life - 11 - 30 Years 6,325,000,000   6,325,000,000     547,000,000   547,000,000         875,000,000   875,000,000         4,805,000,000   4,805,000,000             81,000,000         0   0                 0   0     0   0             0   0             0   0     0   0     0   0     0   0     0   0     17,000,000   17,000,000     0   0                                                       1,503,000,000   1,503,000,000     628,000,000   628,000,000     875,000,000   875,000,000     4,822,000,000   4,822,000,000                                                                    
Remaining Life Over - 30 Years 9,000,000   9,000,000     7,000,000   7,000,000         0   0         0   0             0         0   0                 0   0     0   0             0   0             0   0     0   0     0   0     0   0     0   0     2,000,000   2,000,000     0   0                                                       7,000,000   7,000,000     7,000,000   7,000,000     0   0     2,000,000   2,000,000                                                                    
Remaining Life - Total Years 35,880,000,000   35,880,000,000     901,000,000   901,000,000         1,675,000,000   1,675,000,000         8,880,000,000   8,880,000,000             340,000,000         1,300,000,000   39,000,000                 1,617,000,000   1,617,000,000     726,000,000   726,000,000             125,000,000   125,000,000             915,000,000   915,000,000     6,352,000,000   6,352,000,000     4,552,000,000   4,552,000,000     28,000,000   28,000,000     4,000,000   4,000,000     51,000,000   51,000,000     8,375,000,000   8,375,000,000                                                       4,255,000,000   4,255,000,000     2,580,000,000   2,580,000,000     1,675,000,000   1,675,000,000     31,625,000,000   31,625,000,000                                                                    
Change in our unrealized gain on derivative instruments in accumulated OCI                                                                                                                                                                                                                                                                                                                                                                      
Balance as of beginning-of-year                                                                                                                                                                                                                                                                                                       1,072,000,000 49,000,000 (108,000,000) (129,000,000) (110,000,000) (115,000,000) (15,000,000) 11,000,000 (3,000,000) 1,000,000 1,000,000 3,000,000 (178,000,000) (181,000,000) (206,000,000) (210,000,000)                                
Unrealized holding gains (losses) arising during the period                     (20,000,000) (41,000,000)           2,000,000 2,000,000                         5,000,000 3,000,000         (2,000,000) 0     (19,000,000) (29,000,000)                                                                                                                                                                                                                             (34,000,000) (65,000,000)                                                
Change in foreign currency exchange rate adjustment                                                                                                                                                                                                                                                                                                       22,000,000 (32,000,000)         (14,000,000) 32,000,000                                                
Change in DAC, VOBA, DSI and DFEL                                                                                                                                                                                                                                                                                                                   1,000,000 3,000,000                                                
Income tax benefit (expense)                                                                                                                                                                                                                                                                                                                   17,000,000 11,000,000                                                
Less: Reclassification adjustment for gains (losses) included in net income (loss)               (5,000,000) 9,000,000           2,000,000 2,000,000                         1,000,000 1,000,000                   (7,000,000) (2,000,000)                                                                                                                                                                                                                                 (9,000,000) 10,000,000                                                
Less: Associated amortization of DAC, VOBA, DSI and DFEL                                                                                                                                                                                                                                                                                                                   1,000,000 (1,000,000)                                                
Less: Income tax benefit (expense)                                                                                                                                                                                                                                                                                                                   3,000,000 (3,000,000)                                                
Balance as of end-of-period                                                                                                                                                                                                                                                                                                       1,441,000,000 1,267,000,000 (108,000,000) (129,000,000) (110,000,000) (115,000,000) (40,000,000) (14,000,000) (3,000,000) 1,000,000 1,000,000 3,000,000 (178,000,000) (181,000,000) (206,000,000) (210,000,000)                                
Gains (losses)                                                                                                                                                                                                                                                                                                                                                                      
Gains (losses) (54,000,000) 47,000,000 13,000,000 20,000,000   (4,000,000) 6,000,000 (5,000,000) 8,000,000       13,000,000 9,000,000 25,000,000 17,000,000       75,000,000 322,000,000 37,000,000 303,000,000   (1,000,000) 0 1,000,000 1,000,000                                 13,000,000 179,000,000 (11,000,000) 214,000,000   (10,000,000) 105,000,000 (54,000,000) 12,000,000   0 0 0 43,000,000 (1,000,000) (17,000,000) 2,000,000 (7,000,000)   0 0 0 1,000,000 (15,000,000) 47,000,000 (34,000,000) 51,000,000   69,000,000 493,000,000 (102,000,000) 383,000,000   8,000,000 (79,000,000) 61,000,000 (43,000,000)   (4,000,000) 140,000,000 (41,000,000) 94,000,000   (1,000,000) 8,000,000 (5,000,000) (7,000,000)   1,000,000 1,000,000 1,000,000 0   (10,000,000) (11,000,000) (16,000,000) (11,000,000)   (5,000,000) 9,000,000 (13,000,000) 1,000,000   6,000,000 56,000,000 54,000,000 15,000,000   (160,000,000) (1,174,000,000) 130,000,000 (993,000,000)   (28,000,000) (46,000,000) (18,000,000) (62,000,000)   0 (1,000,000) 1,000,000 0   8,000,000 15,000,000 21,000,000 26,000,000   (5,000,000) 6,000,000 (4,000,000) 9,000,000   13,000,000 9,000,000 25,000,000 17,000,000   (62,000,000) 32,000,000 (8,000,000) (6,000,000)                                                                  
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 (4,000,000) 7,000,000 (4,000,000) 10,000,000                                                                                                                                                                                                                                                                                                                                                              
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     21,000,000                                                                                                                                                                                                                                                                                                                                                                
Information related to fair value hedges                                                                                                                                                                                                                                                                                                                                                                      
Ineffective portion recognized in realized gain (loss) 0 0 0 1,000,000                                                                                                                                                                                                                                                                                                                                                              
Gain (loss) recognized as a component of OCI with the offset to interest expense 1,000,000 1,000,000 2,000,000 2,000,000                                                                                                                                                                                                                                                                                                                                                              
Open credit default swap liabilities                                                                                                                                                                                                                                                                                                                                                                      
Credit rating of underlying obligation                                                                                                                                                                                                                                                                                                                                                           BBB+ BBB+ A BBB BBB BBB-
Maturity date of open credit default swap liabilities Dec. 20, 2012 Dec. 20, 2012 Dec. 20, 2016 Dec. 20, 2016 Mar. 20, 2017 Mar. 20, 2017
Credit default swaps, number of instruments 8   8   9                                                                                                                                                                                                                                                                                                                                                 4 4 2 3 2 2
Fair Value of open credit default swap liabilities (7,000,000)   (7,000,000)   (16,000,000)                                                                                                                                                                                                                                                                                                                                                 0 0 (4,000,000) (12,000,000) (3,000,000) (4,000,000)
Maximum potential payout of open credit default swap liabilities 125,000,000   125,000,000   145,000,000                                                                                                                                                                                                                                                                                                                                                 40,000,000 40,000,000 45,000,000 65,000,000 40,000,000 40,000,000
Credit risk related contingent features collateral                                                                                                                                                                                                                                                                                                                                                                      
Maximum potential payout 125,000,000   125,000,000   145,000,000                                                                                                                                                                                                                                                                                                                                                 40,000,000 40,000,000 45,000,000 65,000,000 40,000,000 40,000,000
Less: Counterparty thresholds 0   0   10,000,000                                                                                                                                                                                                                                                                                                                                                            
Maximum collateral potentially required to post 125,000,000   125,000,000   135,000,000                                                                                                                                                                                                                                                                                                                                                            
Collateral requirement if netting agreements not in place 8,000,000   8,000,000                                                                                                                                                                                                                                                                                                                                                                
Account values with guaranteed withdrawal benefit feature 32,600,000,000   32,600,000,000                                                                                                                                                                                                                                                                                                                                                                
Account values with guaranteed income benefit feature 12,600,000,000   12,600,000,000                                                                                                                                                                                                                                                                                                                                                                
Nonperformance risk adjustment 8,000,000   8,000,000                                                                                                                                                                                                                                                                                                                                                                
Exposure associated with collateralization events 139,000,000   139,000,000                                                                                                                                                                                                                                                                                                                                                                
Collateral support agreements                                                                                                                                                                                                                                                                                                                                                                      
Collateral Posted by Counterparty (Held by Entity) 1,253,000,000   1,253,000,000   1,149,000,000                                                                                                                                                                                                                                                                                                                             11,000,000 1,000,000 131,000,000 99,000,000 130,000,000 65,000,000 475,000,000 548,000,000 506,000,000 436,000,000            
Collateral Posted by LNC (Held by Counterparty) $ (323,000,000)   $ (323,000,000)   $ (299,000,000)                                                                                                                                                                                                                                                                                                                             $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (58,000,000) $ (76,000,000) $ (265,000,000) $ (223,000,000)