v3.26.1
SEGMENTS - Results of segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Segment Information      
Revenues $ 15,092 $ 15,057 $ 16,052
Cost of service, excluding depreciation and amortization (9,822) (9,964) (11,106)
Selling, general and administrative expenses, excluding depreciation and amortization (2,425) (2,372) (2,480)
Other items (68) (115) (5)
Segment adjusted EBITDA $ 2,777 2,606 2,461
Other items, description Other items include workforce rebalancing charges incurred subsequent to March 31, 2024 and other expense    
United States      
Segment Information      
Revenues $ 3,784 3,876 4,295
Cost of service, excluding depreciation and amortization (2,349) (2,476) (2,778)
Selling, general and administrative expenses, excluding depreciation and amortization (581) (638) (735)
Other items (19) (37) (2)
Segment adjusted EBITDA 835 725 781
Japan      
Segment Information      
Revenues 2,284 2,358 2,344
Cost of service, excluding depreciation and amortization (1,441) (1,613) (1,651)
Selling, general and administrative expenses, excluding depreciation and amortization (342) (343) (322)
Other items (15) (13) (9)
Segment adjusted EBITDA 486 390 361
Principal Markets      
Segment Information      
Revenues 5,399 5,206 5,479
Cost of service, excluding depreciation and amortization (3,659) (3,471) (3,957)
Selling, general and administrative expenses, excluding depreciation and amortization (888) (831) (847)
Other items (17) (19) 2
Segment adjusted EBITDA 834 886 677
Strategic Markets      
Segment Information      
Revenues 3,625 3,617 3,934
Cost of service, excluding depreciation and amortization (2,373) (2,405) (2,720)
Selling, general and administrative expenses, excluding depreciation and amortization (614) (561) (577)
Other items (16) (46) 4
Segment adjusted EBITDA $ 622 $ 606 $ 642