Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 113	$ 122	$ 343	$ 365
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Estimated annual amortization expense, remainder of 2020	118		118
Estimated annual amortization expense, 2021	449		449
Estimated annual amortization expense, 2022	357		357
Estimated annual amortization expense, 2023	259		259
Estimated annual amortization expense, 2024	242		242
Estimated annual amortization expense, thereafter	$ 1,900		$ 1,900