v3.26.1
Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Increase (Decrease) in AOCI [Roll Forward]      
Balance $ 4,515 $ 3,810 $ 3,454
Other comprehensive (loss) income, net of tax (261) 22 (144)
Balance 5,184 4,515 3,810
Currency Translation      
Increase (Decrease) in AOCI [Roll Forward]      
Balance (378) (340) (293)
Other comprehensive (loss) income before reclassifications 113 (38) (47)
Amounts reclassified from accumulated other comprehensive loss, net 0 0 0
Other comprehensive (loss) income, net of tax 113 (38) (47)
Balance (265) (378) (340)
Cash Flow Hedge      
Increase (Decrease) in AOCI [Roll Forward]      
Balance 16 (62) (5)
Other comprehensive (loss) income before reclassifications (584) (89) 74
Amounts reclassified from accumulated other comprehensive loss, net 177 167 (131)
Other comprehensive (loss) income, net of tax (407) 78 (57)
Balance (391) 16 (62)
Postretirement Benefit Plans      
Increase (Decrease) in AOCI [Roll Forward]      
Balance 4 21 60
Other comprehensive (loss) income before reclassifications 44 (14) (33)
Amounts reclassified from accumulated other comprehensive loss, net (13) (3) (6)
Other comprehensive (loss) income, net of tax 31 (17) (39)
Balance 35 4 21
AOCI Attributable to Parent      
Increase (Decrease) in AOCI [Roll Forward]      
Balance (358) (381) (238)
Other comprehensive (loss) income before reclassifications (427) (141) (6)
Amounts reclassified from accumulated other comprehensive loss, net 164 164 (137)
Other comprehensive (loss) income, net of tax (263) 23 (143)
Balance $ (621) $ (358) $ (381)