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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Pay vs Performance Disclosure [Table]          
Pay vs Performance [Table Text Block]
The following information is intended to show the relationship between the executive compensation actually paid by our Company and our financial performance.
Year
Summary Compensation Table Total for PEO-11
($)
Summary Compensation Table Total for PEO-21
($)
Compensation Actually Paid to PEO-12
($)
Compensation Actually Paid to PEO-22
($)
Average Summary Compensation Table Total for Non-PEO Named Executive Officers2,3
($)
Average Compensation Actually Paid to Non-PEO Named Executive Officers2,3
($)
Value of Initial Fixed $100 Investment
 Based On:		Net Income
(in 000s)
($)		Operating EPS
($)
Total Shareholder Return
 ($)4
Peer Group Total
Shareholder
Return
   ($)4,5
20228,905,4198,871,21719,165,33319,247,5383,081,2956,745,194138133739,7048.15
20218,353,7548,323,6666,084,8196,060,0502,906,8772,237,094107121744,9596.86
20209,158,9108,443,3642,393,7552,405,3153,315,8031,441,87910788731,7736.88
20198,342,2798,337,26323,790,02023,757,3423,119,6636,932,03111898760,7906.75
20187,831,6167,797,4084,284,2434,403,8752,597,7711,405,1118379701,4666.13
        
Named Executive Officers, Footnote [Text Block] Amounts shown are reported in the Summary Compensation Table (SCT) for the Principal Executive Officers (PEOs), Gary L. Coleman (PEO-1) and Larry M. Hutchinson (PEO-2).Amounts shown represent the total average reported in the Summary Compensation Table for the Non-PEO NEOs. The Company’s Non-PEO NEOs for 2021 and 2022 were Frank M. Svoboda, J. Matthew Darden, Steven K. Greer, and Michael C. Majors. The Non-PEO NEOs for 2018 to 2020 were Messrs. Svoboda, Darden, Greer, and W. Michael Pressley.        
Peer Group Issuers, Footnote [Text Block] The Company’s peer group consists of the Standard & Poor’s (S&P) Life and Health Insurance Index and is set forth in Part II, Item 5 of the Form 10-K for the fiscal year ended December 31, 2022.        
Adjustment To PEO Compensation, Footnote [Text Block] Amounts shown represent compensation actually paid (CAP) and include adjustments for the changes in the fair values of performance share awards and option awards, as well as adjustments for the aggregate change in the actuarial present value of accumulated benefits and actuarially-determined service costs for services rendered under all defined benefit and actuarial pension plans reported in the SCT for Messrs. Coleman (PEO-1) and Hutchinson (PEO-2) and for the average of the Non-PEO Named Executive Officers (NEOs) Frank M. Svoboda, J. Matthew Darden, Steven K. Greer, and Michael C. Majors for 2021 and 2022, and Messrs. Svoboda, Darden, Greer, and W. Michael Pressley for 2018 to 2020. To calculate the CAP, the following amounts were deducted and added to the SCT Total:
PEO-1
YearSCT TotalEquity Award-related Additions (Deductions) to CAPPension-related Additions (Deductions) to CAPCAP
Adjustment for the Fair Value of Equity Awards as of Year-End Adjustment for the Change in the Fair Value of the Prior Years' Awards, Unvested as of Year-EndAdjustment for the Change in the Fair Value of the Prior Years' Awards that Vested during the YearAdjustment for the Aggregate Change in the Present Value of the Accumulated Benefit under the Pension PlansAdjustment for the Service Cost
20228,905,4193,119,5606,499,470692,092—(51,208)19,165,333
20218,353,754(321,200)(1,700,782)(309,130)—62,1776,084,819
20209,158,910(154,340)(4,084,180)(654,480)(1,939,280)67,1252,393,755
20198,342,2793,086,15011,905,3451,110,430(717,872)63,68823,790,020
20187,831,616(1,486,450)(1,555,361)(557,127)—51,5654,284,243
PEO-2
YearSCT TotalEquity Award-related Additions (Deductions) to CAPPension-related Additions (Deductions) to CAPCAP
Adjustment for the Fair Value of Equity Awards as of Year-EndAdjustment for the Change in the Fair Value of the Prior Years' Awards, Unvested as of Year-EndAdjustment for the Change in the Fair Value of the Prior Years' Awards that Vested during the YearAdjustment for the Aggregate Change in the Present Value of the Accumulated Benefit under the Pension PlansAdjustment for the Service Cost
20228,871,2173,119,5606,499,470692,092—65,19919,247,538
20218,323,666(321,200)(1,700,782)(309,130)—67,4966,060,050
20208,443,364(154,340)(4,084,180)(654,480)(1,210,731)65,6822,405,315
20198,337,2633,086,15011,905,3451,110,430(745,486)63,64023,757,342
20187,797,408(1,486,450)(1,527,561)(544,602)—165,0804,403,875
        
Non-PEO NEO Average Total Compensation Amount $ 3,081,295 $ 2,906,877 $ 3,315,803 $ 3,119,663 $ 2,597,771
Non-PEO NEO Average Compensation Actually Paid Amount $ 6,745,194 2,237,094 1,441,879 6,932,031 1,405,111
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Amounts shown represent compensation actually paid (CAP) and include adjustments for the changes in the fair values of performance share awards and option awards, as well as adjustments for the aggregate change in the actuarial present value of accumulated benefits and actuarially-determined service costs for services rendered under all defined benefit and actuarial pension plans reported in the SCT for Messrs. Coleman (PEO-1) and Hutchinson (PEO-2) and for the average of the Non-PEO Named Executive Officers (NEOs) Frank M. Svoboda, J. Matthew Darden, Steven K. Greer, and Michael C. Majors for 2021 and 2022, and Messrs. Svoboda, Darden, Greer, and W. Michael Pressley for 2018 to 2020. To calculate the CAP, the following amounts were deducted and added to the SCT Total:
Average Non-PEO NEOs
YearSCT TotalEquity Award-related Additions (Deductions) to CAPPension-related Additions (Deductions) to CAPCAP
Adjustment for the Fair Value of Equity Awards as of Year-EndAdjustment for the Change in the Fair Value of the Prior Years' Awards, Unvested as of Year-EndAdjustment for the Change in the Fair Value of the Prior Years' Awards that Vested during the YearAdjustment for the Aggregate Change in the Present Value of the Accumulated Benefit under the Pension PlansAdjustment for the Service Cost
20223,081,2951,102,0602,083,150242,997—235,6926,745,194
20212,906,877(98,330)(420,168)(103,374)(289,742)241,8312,237,094
20203,315,803(45,053)(1,106,602)(192,601)(737,316)207,6481,441,879
20193,119,663949,8642,946,444448,501(693,092)160,6516,932,031
20182,597,771(474,106)(518,727)(216,747)(131,262)148,1821,405,111
        
Compensation Actually Paid vs. Total Shareholder Return [Text Block] gl-20230303_g28.jpg        
Compensation Actually Paid vs. Net Income [Text Block] gl-20230303_g30.jpg        
Compensation Actually Paid vs. Company Selected Measure [Text Block] gl-20230303_g29.jpggl-20230303_g31.jpg        
Tabular List [Table Text Block]
Net Operating Income EPS
Underwriting Income
Net Operating Income ROE
        
Total Shareholder Return Amount $ 138 107 107 118 83
Peer Group Total Shareholder Return Amount 133 121 88 98 79
Net Income (Loss) $ 739,704 $ 744,959 $ 731,773 $ 760,790 $ 701,466
Company Selected Measure Amount | $ / shares 8.15 6.86 6.88 6.75 6.13
Additional 402(v) Disclosure [Text Block] Calculated based on $100 invested as of market close on December 31, 2017, including reinvestment of dividends, for each fiscal year.        
Measure [Axis]: 1          
Pay vs Performance Disclosure [Table]          
Measure Name Net Operating Income EPS        
Measure [Axis]: 2          
Pay vs Performance Disclosure [Table]          
Measure Name Underwriting Income        
Measure [Axis]: 3          
Pay vs Performance Disclosure [Table]          
Measure Name Net Operating Income ROE        
Coleman [Member]          
Pay vs Performance Disclosure [Table]          
PEO Total Compensation Amount $ 8,905,419 $ 8,353,754 $ 9,158,910 $ 8,342,279 $ 7,831,616
PEO Actually Paid Compensation Amount $ 19,165,333 6,084,819 2,393,755 23,790,020 4,284,243
PEO Name Gary L. Coleman        
Hutchinson [Member]          
Pay vs Performance Disclosure [Table]          
PEO Total Compensation Amount $ 8,871,217 8,323,666 8,443,364 8,337,263 7,797,408
PEO Actually Paid Compensation Amount $ 19,247,538 6,060,050 2,405,315 23,757,342 4,403,875
PEO Name Larry M. Hutchinson        
PEO [Member] | Coleman [Member] | Equity Awards as of Year End [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards $ 3,119,560 (321,200) (154,340) 3,086,150 (1,486,450)
PEO [Member] | Coleman [Member] | Adjustment, Equity Awards Granted in Prior Years, Unvested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 6,499,470 (1,700,782) (4,084,180) 11,905,345 (1,555,361)
PEO [Member] | Coleman [Member] | Equity Awards Granted in Prior Years, Vested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 692,092 (309,130) (654,480) 1,110,430 (557,127)
PEO [Member] | Coleman [Member] | Adjustment, Present Value of the Accumulated Benefit under the Pension Plans [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 0 0 (1,939,280) (717,872) 0
PEO [Member] | Coleman [Member] | Adjustment, Service Cost [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards (51,208) 62,177 67,125 63,688 51,565
PEO [Member] | Hutchinson [Member] | Equity Awards as of Year End [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 3,119,560 (321,200) (154,340) 3,086,150 (1,486,450)
PEO [Member] | Hutchinson [Member] | Adjustment, Equity Awards Granted in Prior Years, Unvested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 6,499,470 (1,700,782) (4,084,180) 11,905,345 (1,527,561)
PEO [Member] | Hutchinson [Member] | Equity Awards Granted in Prior Years, Vested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 692,092 (309,130) (654,480) 1,110,430 (544,602)
PEO [Member] | Hutchinson [Member] | Adjustment, Present Value of the Accumulated Benefit under the Pension Plans [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 0 0 (1,210,731) (745,486) 0
PEO [Member] | Hutchinson [Member] | Adjustment, Service Cost [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 65,199 67,496 65,682 63,640 165,080
Non-PEO NEO [Member] | Equity Awards as of Year End [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 1,102,060 (98,330) (45,053) 949,864 (474,106)
Non-PEO NEO [Member] | Adjustment, Equity Awards Granted in Prior Years, Unvested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 2,083,150 (420,168) (1,106,602) 2,946,444 (518,727)
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 242,997 (103,374) (192,601) 448,501 (216,747)
Non-PEO NEO [Member] | Adjustment, Present Value of the Accumulated Benefit under the Pension Plans [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards 0 (289,742) (737,316) (693,092) (131,262)
Non-PEO NEO [Member] | Adjustment, Service Cost [Member]          
Pay vs Performance Disclosure [Table]          
Adjustment to Compensation Amount, Equity Awards $ 235,692 $ 241,831 $ 207,648 $ 160,651 $ 148,182