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Divestitures (Details)
$ in Millions, ₩ in Billions
3 Months Ended 9 Months Ended
Feb. 01, 2024
USD ($)
Feb. 01, 2024
KRW (₩)
Sep. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
KRW (₩)
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 25, 2025
Feb. 01, 2024
KRW (₩)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net gain on sale of business     $ 0     $ 8   $ 0 $ 90    
Proceeds from sale of business               $ 12 255    
Pakistan Business                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Ownership percentage, parent     71.00%         71.00%      
Ownership percentage, expected     20.00%         20.00%      
Pakistan Business Divestiture                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Disposal, ownership interest disposed                   51.00%  
South Korea Divestiture | Disposed of by Sale                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Divestiture, consideration $ 294                   ₩ 384
Net gain on sale of business           $ 8 $ 82   $ 90    
Proceeds from sale of business $ 247 ₩ 330   $ 12 ₩ 18