v3.26.1
Fair Value Measurement - Summary of By Level Within Fair Value Hierarchy, Plan's Assets Fair Value (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 2,239,194,835 $ 2,002,495,932
Common/Collective Trust Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,220,829,081 651,401,086
Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 89,127 105,409
Mutual Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 423,577,200 808,872,959
Participant Self-directed Brokerage Account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 201,060,562 175,264,994
BAT American Depository Shares    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 147,840,765 99,635,022
Fidelity Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 2,702,938 1,652,804
BAT Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 150,543,703 101,287,826
Stable Value Collective Trust Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 243,095,162 265,563,658
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 775,270,592 1,085,531,188
Level 1 | Common/Collective Trust Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 1 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 89,127 105,409
Level 1 | Mutual Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 423,577,200 808,872,959
Level 1 | Participant Self-directed Brokerage Account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 201,060,562 175,264,994
Level 1 | BAT American Depository Shares    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 147,840,765 99,635,022
Level 1 | Fidelity Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 2,702,938 1,652,804
Level 1 | BAT Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 150,543,703 101,287,826
Level 1 | Stable Value Collective Trust Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,463,924,243 916,964,744
Level 2 | Common/Collective Trust Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,220,829,081 651,401,086
Level 2 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Participant Self-directed Brokerage Account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | BAT American Depository Shares    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Fidelity Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | BAT Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Stable Value Collective Trust Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 243,095,162 265,563,658
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Common/Collective Trust Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Participant Self-directed Brokerage Account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | BAT American Depository Shares    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Fidelity Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | BAT Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Stable Value Collective Trust Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 0 $ 0