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EMPLOYEE BENEFIT PLANS - Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Benefit plan assets by asset class    
Benefit plan assets $ 15,641 $ 20,046
Level 1 and Level 2    
Benefit plan assets by asset class    
Benefit plan assets 3,312 7,393
Level 1 and Level 2 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 894 4,487
Level 1 and Level 2 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 445 1,195
Level 1 and Level 2 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 1,443 1,048
Level 1 and Level 2 | Delta common stock    
Benefit plan assets by asset class    
Benefit plan assets 343 407
Level 1 and Level 2 | Real assets    
Benefit plan assets by asset class    
Benefit plan assets 187 256
Level 1    
Benefit plan assets by asset class    
Benefit plan assets 1,486 3,900
Level 1 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 629 2,390
Level 1 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 420 1,034
Level 1 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 77 69
Level 1 | Delta common stock    
Benefit plan assets by asset class    
Benefit plan assets 343 407
Level 1 | Real assets    
Benefit plan assets by asset class    
Benefit plan assets 17 0
Level 2    
Benefit plan assets by asset class    
Benefit plan assets 1,826 3,493
Level 2 | Cash equivalents    
Benefit plan assets by asset class    
Benefit plan assets 265 2,097
Level 2 | Equities and equity-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 25 161
Level 2 | Fixed income and fixed income-related instruments    
Benefit plan assets by asset class    
Benefit plan assets 1,366 979
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 170 256
NAV    
Benefit plan assets by asset class    
Benefit plan assets $ 12,329 $ 12,653