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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net loss $ (2,822) $ (3,561) $ (4,714)
Available-for-sale securities:      
Unrealized gains on available-for-sale securities 31 120 210
Less: net realized (gains) losses on available-for-sale securities reclassified in net loss (3) 4 38
Net increase from available-for-sale securities 28 124 248
Cash flow hedges:      
Net realized losses on derivative instruments reclassified in net loss 0 0 8
Net increase from derivatives designated as hedging instruments 0 0 8
Gains (losses) on foreign currency translation 11 (8) 0
Pension and postretirement obligation adjustments 16 (3) (9)
Total other comprehensive income 55 113 247
Comprehensive loss $ (2,767) $ (3,448) $ (4,467)