Fair Value Measurements and Investments Debt Instrument Fair Value (Details) - USD ($) $ in Millions		Mar. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Long-term debt, including current portion		$ 11,200	$ 13,151
0.50% convertible senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		0.50%
Debt, long-term and short-term, combined amount		$ 31	30
Long-term debt, fair value		36	34
Variable interest rate Term Loan A maturing 2021
Debt Instrument [Line Items]
Debt, long-term and short-term, combined amount		0	4,074
Long-term debt, fair value		0	4,130
Variable interest rate Term Loan A-1 maturing 2023
Debt Instrument [Line Items]
Debt, long-term and short-term, combined amount		5,013	0
Long-term debt, fair value		5,047	0
Variable interest rate U.S. Term Loan B-2 maturing 2023
Debt Instrument [Line Items]
Debt, long-term and short-term, combined amount		0	2,968
Long-term debt, fair value		0	2,989
Variable interest rate U.S. Term Loan B-3 maturing 2023
Debt Instrument [Line Items]
Debt, long-term and short-term, combined amount		2,452	0
Long-term debt, fair value		2,470	0
Euro Term Loan B-2
Debt Instrument [Line Items]
Debt, long-term and short-term, combined amount	[1]	0	1,000
Long-term debt, fair value	[1]	$ 0	1,010
7.375% senior secured notes due 2023
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		7.375%
Debt, long-term and short-term, combined amount		$ 0	1,835
Long-term debt, fair value		$ 0	2,062
1.50% convertible notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		1.50%
Debt, long-term and short-term, combined amount		$ 924	0
Long-term debt, fair value		$ 1,192	0
10.50% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		10.50%
Debt, long-term and short-term, combined amount		$ 0	3,244
Long-term debt, fair value		$ 0	3,956
4.750% senior unsecured notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		4.75%
Debt, long-term and short-term, combined amount		$ 2,280	0
Long-term debt, fair value		2,301	0
Total
Debt Instrument [Line Items]
Long-term debt, including current portion		10,700	13,151
Long-term debt, fair value		$ 11,046	$ 14,181

[1] Euro Term Loan B-2 outstanding principal amount as of June 30, 2017 was based upon the Euro to U.S. dollar exchange rate as of that date.