Goodwill and Other Intangible Assets, Net - Future Estimated Amortization Expense (Details) $ in Millions	Mar. 31, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated future intangible amortization expense, 2020	$ 608
Estimated future intangible amortization expense, 2021	807
Estimated future intangible amortization expense, 2022	807
Estimated future intangible amortization expense, 2023	807
Estimated future intangible amortization expense, 2024	$ 805