Long-Term Debt - Summary (Details) - USD ($)	Oct. 22, 2020	Mar. 26, 2020
Unsecured Notes, 1.300%
Long-Term Debt
Principal Amount	$ 1,000,000,000
Interest Rate	1.30%
Discount	$ 5,000,000
Unsecured Notes, 1.700%
Long-Term Debt
Principal Amount	$ 1,250,000,000
Interest Rate	1.70%
Discount	$ 10,000,000
Unsecured Notes, 3.000%
Long-Term Debt
Principal Amount	$ 1,750,000,000
Interest Rate	3.00%
Discount	$ 17,000,000
Unsecured Notes, 4.000%
Long-Term Debt
Principal Amount		$ 750,000,000
Interest Rate		4.00%
Discount		$ 4,000,000
Unsecured Notes, 4.500%
Long-Term Debt
Principal Amount		$ 1,250,000,000
Interest Rate		4.50%
Discount		$ 12,000,000
Unsecured Notes, 5.000%
Long-Term Debt
Principal Amount		$ 750,000,000
Interest Rate		5.00%
Discount		$ 10,000,000
Unsecured Notes, 5.125%
Long-Term Debt
Principal Amount		$ 1,250,000,000
Interest Rate		5.125%
Discount		$ 13,000,000
Unsecured Notes
Long-Term Debt
Principal Amount	$ 4,000,000,000.0	$ 4,000,000,000.0