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EMPLOYEE BENEFIT PLANS - Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Benefit plan assets by asset class    
Benefit plan assets $ 15,672 $ 16,166
Level 1 and Level 2    
Benefit plan assets by asset class    
Benefit plan assets 3,234 4,749
Level 1 and Level 2 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 1,165 2,158
Level 1 and Level 2 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 468 1,156
Level 1 and Level 2 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 981 769
Level 1 and Level 2 | Delta common stock    
Benefit plan assets by asset class    
Benefit plan assets 595 419
Level 1 and Level 2 | Real assets    
Benefit plan assets by asset class    
Benefit plan assets 25 247
Level 1    
Benefit plan assets by asset class    
Benefit plan assets 1,988 1,848
Level 1 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 85 300
Level 1 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 330 471
Level 1 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 978 647
Level 1 | Delta common stock    
Benefit plan assets by asset class    
Benefit plan assets 595 419
Level 1 | Real assets    
Benefit plan assets by asset class    
Benefit plan assets 0 11
Level 2    
Benefit plan assets by asset class    
Benefit plan assets 1,246 2,901
Level 2 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 1,080 1,858
Level 2 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 138 685
Level 2 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 3 122
Level 2 | Delta common stock    
Benefit plan assets by asset class    
Benefit plan assets 0 0
Level 2 | Real assets    
Benefit plan assets by asset class    
Benefit plan assets 25 236
NAV    
Benefit plan assets by asset class    
Benefit plan assets $ 12,438 $ 11,417