Fair Value Measurements and Investments Debt Instrument Fair Value (Details) - USD ($) $ in Millions		Jun. 29, 2018	Jun. 30, 2017
0.50% convertible senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		0.50%
7.375% senior secured notes due 2023
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		7.375%
1.50% convertible notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		1.50%
10.50% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		10.50%
4.750% senior unsecured notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		4.75%
Carrying Value
Debt Instrument [Line Items]
Long-term debt		$ 10,672	$ 13,151
Carrying Value | 0.50% convertible senior notes due 2020
Debt Instrument [Line Items]
Long-term debt		31	30
Carrying Value | Variable interest rate Term Loan A maturing 2021
Debt Instrument [Line Items]
Long-term debt		0	4,074
Carrying Value | Variable interest rate Term Loan A-1 maturing 2023
Debt Instrument [Line Items]
Long-term debt		4,982	0
Carrying Value | Variable interest rate U.S. Term Loan B-2 maturing 2023
Debt Instrument [Line Items]
Long-term debt		0	2,968
Carrying Value | Variable interest rate U.S. Term Loan B-4 maturing 2023
Debt Instrument [Line Items]
Long-term debt		2,448	0
Carrying Value | Variable interest rate Euro Term Loan B-2 maturing 2023
Debt Instrument [Line Items]
Long-term debt	[1]	0	1,000
Carrying Value | 7.375% senior secured notes due 2023
Debt Instrument [Line Items]
Long-term debt		0	1,835
Carrying Value | 1.50% convertible notes due 2024
Debt Instrument [Line Items]
Long-term debt		931	0
Carrying Value | 10.50% senior unsecured notes due 2024
Debt Instrument [Line Items]
Long-term debt		0	3,244
Carrying Value | 4.750% senior unsecured notes due 2026
Debt Instrument [Line Items]
Long-term debt		2,280	0
Level 2 | Fair Value
Debt Instrument [Line Items]
Long-term debt		10,851	14,181
Level 2 | Fair Value | 0.50% convertible senior notes due 2020
Debt Instrument [Line Items]
Long-term debt		34	34
Level 2 | Fair Value | Variable interest rate Term Loan A maturing 2021
Debt Instrument [Line Items]
Long-term debt		0	4,130
Level 2 | Fair Value | Variable interest rate Term Loan A-1 maturing 2023
Debt Instrument [Line Items]
Long-term debt		5,013	0
Level 2 | Fair Value | Variable interest rate U.S. Term Loan B-2 maturing 2023
Debt Instrument [Line Items]
Long-term debt		0	2,989
Level 2 | Fair Value | Variable interest rate U.S. Term Loan B-4 maturing 2023
Debt Instrument [Line Items]
Long-term debt		2,452	0
Level 2 | Fair Value | Variable interest rate Euro Term Loan B-2 maturing 2023
Debt Instrument [Line Items]
Long-term debt	[1]	0	1,010
Level 2 | Fair Value | 7.375% senior secured notes due 2023
Debt Instrument [Line Items]
Long-term debt		0	2,062
Level 2 | Fair Value | 1.50% convertible notes due 2024
Debt Instrument [Line Items]
Long-term debt		1,114	0
Level 2 | Fair Value | 10.50% senior unsecured notes due 2024
Debt Instrument [Line Items]
Long-term debt		0	3,956
Level 2 | Fair Value | 4.750% senior unsecured notes due 2026
Debt Instrument [Line Items]
Long-term debt		$ 2,238	$ 0

[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.