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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Total share-based compensation cost $ 26 $ 20 $ 51 $ 36
Related income tax benefit 4 3 7 5
Total intrinsic value of options exercised 1 0 6 0
Tax benefits from exercised stock options and awards $ 4 $ 1 $ 15 $ 4