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Parent Company Only Condensed Statements of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
REVENUES $ 55,085 $ 54,607 $ 54,022
COSTS AND EXPENSES:      
Operating costs and expenses 33,167 33,405 32,876
Other operating income, net 127 (53) 281
Income from operations 13,118 12,559 11,962
OTHER INCOME (EXPENSE):      
Interest income (expense), net (5,229) (5,188) (4,556)
Total other income (expenses), net (5,616) (5,705) (4,500)
Income before income taxes 7,502 6,854 7,462
Income tax expense (1,649) (1,593) (1,613)
Net income 5,083 4,557 5,055
Parent Company [Member]      
REVENUES 3 1 4
COSTS AND EXPENSES:      
Operating costs and expenses 3 1 4
Other operating income, net 0 (60) 0
Total costs and (income) expenses 3 (59) 4
Income from operations 0 60 0
OTHER INCOME (EXPENSE):      
Interest income (expense), net (4) (4) 2
Equity in income of subsidiaries 6,640 6,021 6,587
Total other income (expenses), net 6,636 6,017 6,589
Income before income taxes 6,636 6,077 6,589
Income tax expense (1,553) (1,520) (1,534)
Net income $ 5,083 $ 4,557 $ 5,055