Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Available Committed Credit Facilities (Narrative) (Details) $ in Millions	36 Months Ended
	Mar. 22, 2019	Dec. 31, 2018 USD ($)	May 02, 2017 USD ($)	Mar. 22, 2016 USD ($)
Successor [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 7,500
Line of Credit Facility, Remaining Borrowing Capacity		5,456
Senior Note Floating Rate Due 2020 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount			$ 750
Senior Note 2.20 Percent Due 2020 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount			$ 1,250
Debt Instrument, Interest Rate, Stated Percentage			2.20%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,000
Revolving Credit Facility [Member] | Successor [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		3,000
Line of Credit Facility, Remaining Borrowing Capacity		2,956
Term Loan Facility due 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 4,500
Line of Credit Facility, Remaining Borrowing Capacity		$ 2,500
Line of Credit Facility, Number of Borrowings		4		7
Borrowings under Term Loan Facility		$ 2,000
Term Loan Facility due 2020 [Member] | Scenario, Forecast [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	3 years
Term Loan Facility due 2020 [Member] | Successor [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		4,500
Line of Credit Facility, Remaining Borrowing Capacity		$ 2,500