Commitments, Contingencies and Debt - Long-term Debt Transactions (Details) - USD ($) $ in Millions			1 Months Ended	9 Months Ended
	Jun. 26, 2021	Apr. 01, 2021	Sep. 25, 2021	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Debt Instrument [Line Items]
Repayments of long-term debt				$ 4,145	$ 4,395
Senior Notes
Debt Instrument [Line Items]
Outstanding aggregate principal amount			$ 23,634	23,634		$ 27,893
Senior Notes | 2021 Tender Offers, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				2,323
Senior Notes | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				428
Senior Notes | 2021 Debt Redemption, Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt				1,244
Senior Notes | 2021 Debt Repayment, Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt				$ 145
Senior Notes Due June 2022 | Senior Notes
Debt Instrument [Line Items]
Interest rate			3.50%	3.50%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 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 | 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]
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%
Outstanding aggregate principal amount			$ 0	$ 0		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 | 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				797
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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 727	$ 727		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				28
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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 798	$ 798		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				15
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%
Outstanding aggregate principal amount			$ 834	$ 834		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				15
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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 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 | 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%
Outstanding aggregate principal amount			$ 731	$ 731		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				18
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%
Outstanding aggregate principal amount			$ 1,598	$ 1,598		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				68
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%
Outstanding aggregate principal amount			$ 1,856	$ 1,856		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				144
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%
Outstanding aggregate principal amount			$ 2,903	$ 2,903		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 | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				97
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		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 | 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
Senior notes due in September 2021
Debt Instrument [Line Items]
Repayments of long-term debt			$ 34
Senior notes due in September 2021 | Senior Notes
Debt Instrument [Line Items]
Interest rate			3.125%	3.125%
Outstanding aggregate principal amount			$ 0	$ 0		34
Senior notes due in September 2021 | Senior Notes | 2021 Tender Offers, Senior Notes
Debt Instrument [Line Items]
Amount repurchased
Senior notes due in September 2021 | Senior Notes | 2021 Repurchases, Senior Notes
Debt Instrument [Line Items]
Amount repurchased
Senior notes due in September 2021 | Senior Notes | 2021 Debt Redemption, Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt
Senior notes due in September 2021 | Senior Notes | 2021 Debt Repayment, Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt				34
Other long-term debt | Senior Notes
Debt Instrument [Line Items]
Outstanding aggregate principal amount			$ 9,073	9,073		$ 9,192
Other long-term debt | Senior Notes | 2021 Tender Offers, Senior Notes
Debt Instrument [Line Items]
Amount repurchased				0
Other long-term debt | Senior Notes | 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