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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 3,296 $ 3,777
Other comprehensive income (loss), net of tax (expense) benefit:    
Currency translation adjustments, net of deferred taxes of $74 and $(21) 948 (436)
Cash flow hedges:    
Deferred gains (losses), net of deferred taxes of $1, and $(1) (20) 19
Realized (gains) losses reclassified to net income, net of deferred taxes of $5 and $(1) (20) 1
Employee benefit obligations and other, net of deferred taxes of $18 and $5 (56) (24)
Other comprehensive income (loss) 851 (440)
Comprehensive income 4,147 3,337
Less: Net income (loss) attributable to noncontrolling interests (79) (79)
Less: Other comprehensive income (loss) attributable to noncontrolling interests 4 (13)
Comprehensive income attributable to Comcast Corporation $ 4,222 $ 3,429