Commitments, Contingencies and Debt - Long-term Debt Transactions (Details) - USD ($) $ in Millions | Jun. 26, 2021 | Apr. 01, 2021 | Jun. 26, 2021 | Jun. 26, 2021 | Jun. 27, 2020 | Dec. 26, 2020 |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 3,090 | $ 3,824 | |
Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Outstanding aggregate principal amount | $ 24,755 | | $ 24,755 | 24,755 | | $ 27,893 |
Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 2,323 | | |
Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | $ 207 | 207 | | |
Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 447 | | |
Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 111 | | |
Senior Notes Due June 2022 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 3.50% | | 3.50% | 3.50% | | |
Outstanding aggregate principal amount | $ 631 | | $ 631 | $ 631 | | 631 |
Senior Notes Due June 2022 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due June 2022 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due June 2022 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due June 2022 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due June 2023 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 4.00% | | 4.00% | 4.00% | | |
Outstanding aggregate principal amount | $ 0 | | $ 0 | $ 0 | | 447 |
Senior Notes Due June 2023 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due June 2023 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due June 2023 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | | 4.00% | | | | |
Repayments of long-term debt | | $ 447 | | 447 | | |
Senior Notes Due June 2023 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due July 2025 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 3.95% | | 3.95% | 3.95% | | |
Outstanding aggregate principal amount | $ 797 | | $ 797 | $ 797 | | 1,609 |
Repayments of long-term debt | $ 797 | | | | | |
Senior Notes Due July 2025 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 812 | | |
Senior Notes Due July 2025 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due July 2025 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due July 2025 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due June 2026 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 3.00% | | 3.00% | 3.00% | | |
Outstanding aggregate principal amount | $ 1,876 | | $ 1,876 | $ 1,876 | | 2,000 |
Senior Notes Due June 2026 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 88 | | |
Senior Notes Due June 2026 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 36 | | |
Senior Notes Due June 2026 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due June 2026 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due July 2028 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 6.375% | | 6.375% | 6.375% | | |
Outstanding aggregate principal amount | $ 218 | | $ 218 | $ 218 | | 235 |
Senior Notes Due July 2028 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 17 | | |
Senior Notes Due July 2028 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due July 2028 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due July 2028 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due January 2029 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 4.625% | | 4.625% | 4.625% | | |
Outstanding aggregate principal amount | $ 751 | | $ 751 | $ 751 | | 1,100 |
Senior Notes Due January 2029 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 345 | | |
Senior Notes Due January 2029 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 4 | | |
Senior Notes Due January 2029 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due January 2029 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due April 2030 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 3.75% | | 3.75% | 3.75% | | |
Outstanding aggregate principal amount | $ 743 | | $ 743 | $ 743 | | 1,000 |
Senior Notes Due April 2030 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 254 | | |
Senior Notes Due April 2030 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 3 | | |
Senior Notes Due April 2030 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due April 2030 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due March 2032 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 6.75% | | 6.75% | 6.75% | | |
Outstanding aggregate principal amount | $ 371 | | $ 371 | $ 371 | | 437 |
Senior Notes Due March 2032 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 66 | | |
Senior Notes Due March 2032 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due March 2032 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due March 2032 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due July 2035 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 5.00% | | 5.00% | 5.00% | | |
Outstanding aggregate principal amount | $ 805 | | $ 805 | $ 805 | | 1,000 |
Senior Notes Due July 2035 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 187 | | |
Senior Notes Due July 2035 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 8 | | |
Senior Notes Due July 2035 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due July 2035 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due January 2039 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 6.875% | | 6.875% | 6.875% | | |
Outstanding aggregate principal amount | $ 839 | | $ 839 | $ 839 | | 878 |
Senior Notes Due January 2039 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 29 | | |
Senior Notes Due January 2039 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 10 | | |
Senior Notes Due January 2039 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due January 2039 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due August 2039 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 7.125% | | 7.125% | 7.125% | | |
Outstanding aggregate principal amount | $ 876 | | $ 876 | $ 876 | | 931 |
Senior Notes Due August 2039 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 51 | | |
Senior Notes Due August 2039 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 4 | | |
Senior Notes Due August 2039 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due August 2039 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due October 2039 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 4.625% | | 4.625% | 4.625% | | |
Outstanding aggregate principal amount | $ 399 | | $ 399 | $ 399 | | 500 |
Senior Notes Due October 2039 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 101 | | |
Senior Notes Due October 2039 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due October 2039 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due October 2039 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due February 2040 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 6.50% | | 6.50% | 6.50% | | |
Outstanding aggregate principal amount | $ 734 | | $ 734 | $ 734 | | 788 |
Senior Notes Due February 2040 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 39 | | |
Senior Notes Due February 2040 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 15 | | |
Senior Notes Due February 2040 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due February 2040 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due June 2042 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 5.00% | | 5.00% | 5.00% | | |
Outstanding aggregate principal amount | $ 1,659 | | $ 1,659 | $ 1,659 | | 2,000 |
Senior Notes Due June 2042 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 334 | | |
Senior Notes Due June 2042 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 7 | | |
Senior Notes Due June 2042 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due June 2042 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due July 2045 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 5.20% | | 5.20% | 5.20% | | |
Outstanding aggregate principal amount | $ 1,944 | | $ 1,944 | $ 1,944 | | 2,000 |
Senior Notes Due July 2045 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due July 2045 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 56 | | |
Senior Notes Due July 2045 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due July 2045 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |
Senior Notes Due June 2046 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate | 4.375% | | 4.375% | 4.375% | | |
Outstanding aggregate principal amount | $ 2,936 | | $ 2,936 | $ 2,936 | | 3,000 |
Senior Notes Due June 2046 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior Notes Due June 2046 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 64 | | |
Senior Notes Due June 2046 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior Notes Due June 2046 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior notes due in February 2021 | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Outstanding aggregate principal amount | 0 | | 0 | 0 | | 111 |
Senior notes due in February 2021 | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior notes due in February 2021 | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Senior notes due in February 2021 | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Senior notes due in February 2021 | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 111 | | |
Other long-term debt | Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Outstanding aggregate principal amount | $ 9,176 | | $ 9,176 | 9,176 | | $ 9,226 |
Other long-term debt | Senior Notes | 2021 Tender Offers, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Other long-term debt | Senior Notes | Q2 2021 Repurchases, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Amount repurchased | | | | 0 | | |
Other long-term debt | Senior Notes | 2021 Debt Redemption, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | 0 | | |
Other long-term debt | Senior Notes | 2021 Debt Repayment, Senior Notes | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Repayments of long-term debt | | | | $ 0 | | |