Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Narrative (Details) $ in Millions	36 Months Ended
	Mar. 22, 2019	Mar. 31, 2018 USD ($)	Feb. 13, 2018 USD ($)	Mar. 22, 2016 USD ($)
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,300
Term Loan Facility due 2019 [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 4,500
Term Loan Facility due 2019 [Member] | Successor [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,000
Line of Credit Facility, Number of Borrowings		3
Long-term Line of Credit		$ 1,500
Term Loan Facility due 2019 [Member] | Scenario, Forecast [Member]
Short-term Debt [Line Items]
Debt Instrument, Term	3 years
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,000
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Percentage of outstanding amounts borrowed utilized as collateral			105.00%
Interest rate in addition to LIBOR			0.75%
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]
Short-term Debt [Line Items]
Line of Credit Facility, amount pledged as collateral		42
Short-term debt		$ 40
Maximum [Member] | Term Loan Facility due 2019 [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Number of Borrowings				7