Borrowings - Schedule of Long-term Debt Instruments (Details) € in Millions, £ in Millions, $ in Millions	Jan. 03, 2021 USD ($)	Jan. 03, 2021 EUR (€)	Jan. 03, 2021 GBP (£)	Sep. 27, 2020 USD ($)	Dec. 29, 2019 USD ($)	Dec. 29, 2019 EUR (€)	Dec. 29, 2019 GBP (£)
Debt Instrument [Line Items]
Effective interest rate	2.85%	2.85%	2.85%		3.19%	3.19%	3.19%
Borrowed under the commercial paper program	$ 1,800				$ 1,100
Total long-term debt	32,635				26,494
Senior Notes
Debt Instrument [Line Items]
Total long-term debt				$ 7,500
Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Long-term debt	34,434				27,594
Less current portion	1,799				1,100
Total long-term debt	$ 32,635				$ 26,494
3% Zero Coupon Convertible Subordinated Debentures due 2020
Debt Instrument [Line Items]
Effective interest rate	0.00%	0.00%	0.00%		3.00%	3.00%	3.00%
Long-term debt	$ 0				$ 51
Stated interest rate (as a percent)	3.00%	3.00%	3.00%
2.95% Debentures due 2020
Debt Instrument [Line Items]
Effective interest rate	0.00%	0.00%	0.00%		3.15%	3.15%	3.15%
Long-term debt	$ 0				$ 549
Stated interest rate (as a percent)	2.95%	2.95%	2.95%
1.950% Notes due 2020
Debt Instrument [Line Items]
Effective interest rate	0.00%	0.00%	0.00%		1.99%	1.99%	1.99%
Long-term debt	$ 0				$ 500
Stated interest rate (as a percent)	1.95%	1.95%	1.95%
3.55% Notes due 2021
Debt Instrument [Line Items]
Effective interest rate	3.67%	3.67%	3.67%		3.67%	3.67%	3.67%
Long-term debt	$ 450				$ 449
Stated interest rate (as a percent)	3.55%	3.55%	3.55%
2.45% Notes due 2021
Debt Instrument [Line Items]
Effective interest rate	2.48%	2.48%	2.48%		2.48%	2.48%	2.48%
Long-term debt	$ 350				$ 349
Stated interest rate (as a percent)	2.45%	2.45%	2.45%
1.65% Notes due 2021
Debt Instrument [Line Items]
Effective interest rate	1.65%	1.65%	1.65%		1.65%	1.65%	1.65%
Long-term debt	$ 999				$ 999
Stated interest rate (as a percent)	1.65%	1.65%	1.65%
0.250% Notes due 2022 (1B Euro 1.2281)(2)/(1B Euro 1.1096)(3)
Debt Instrument [Line Items]
Effective interest rate	0.26%	0.26%	0.26%		0.26%	0.26%	0.26%
Long-term debt	$ 1,227				$ 1,108
Stated interest rate (as a percent)	0.25%	0.25%	0.25%
Debt Instrument, Face Amount | €		€ 1,000				€ 1,000
Foreign currency exchange rate, translation	1.2281	1.2281	1.2281		1.1096	1.1096	1.1096
2.25% Notes due 2022
Debt Instrument [Line Items]
Effective interest rate	2.31%	2.31%	2.31%		2.31%	2.31%	2.31%
Long-term debt	$ 999				$ 998
Stated interest rate (as a percent)	2.25%	2.25%	2.25%
6.73% Debentures due 2023
Debt Instrument [Line Items]
Effective interest rate	6.73%	6.73%	6.73%		6.73%	6.73%	6.73%
Long-term debt	$ 250				$ 250
Stated interest rate (as a percent)	6.73%	6.73%	6.73%
3.375% Notes due 2023
Debt Instrument [Line Items]
Effective interest rate	3.17%	3.17%	3.17%		3.17%	3.17%	3.17%
Long-term debt	$ 803				$ 804
Stated interest rate (as a percent)	3.375%	3.375%	3.375%
2.05% Notes due 2023
Debt Instrument [Line Items]
Effective interest rate	2.09%	2.09%	2.09%		2.09%	2.09%	2.09%
Long-term debt	$ 499				$ 498
Stated interest rate (as a percent)	2.05%	2.05%	2.05%
0.650% Notes due 2024 (750MM Euro 1.2281)(2)/(750MM Euro 1.1096)(3)
Debt Instrument [Line Items]
Effective interest rate	0.68%	0.68%	0.68%		0.68%	0.68%	0.68%
Long-term debt	$ 919				$ 829
Stated interest rate (as a percent)	0.65%	0.65%	0.65%
Debt Instrument, Face Amount | €		€ 750				€ 750
Foreign currency exchange rate, translation	1.2281	1.2281	1.2281		1.1096	1.1096	1.1096
5.50% Notes due 2024 (500MM 1.3654 GBP )(2)/(500MM GBP 1.2987)(3)
Debt Instrument [Line Items]
Effective interest rate	6.75%	6.75%	6.75%		6.75%	6.75%	6.75%
Long-term debt	$ 679				$ 645
Stated interest rate (as a percent)	5.50%	5.50%	5.50%
Debt Instrument, Face Amount | £			£ 500				£ 500
Foreign currency exchange rate, translation	1.3654	1.3654	1.3654		1.2987	1.2987	1.2987
2.625% Notes due 2025
Debt Instrument [Line Items]
Effective interest rate	2.63%	2.63%	2.63%		2.63%	2.63%	2.63%
Long-term debt	$ 748				$ 748
Stated interest rate (as a percent)	2.625%	2.625%	2.625%
0.55% Notes due 2025(5)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.55%	0.55%	0.55%
0.55% Notes due 2025(5) | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	0.57%	0.57%	0.57%
Total long-term debt	$ 996
2.45% Notes due 2026
Debt Instrument [Line Items]
Effective interest rate	2.47%	2.47%	2.47%		2.47%	2.47%	2.47%
Long-term debt	$ 1,994				$ 1,993
Stated interest rate (as a percent)	2.45%	2.45%	2.45%
2.95% Notes due 2027
Debt Instrument [Line Items]
Effective interest rate	2.96%	2.96%	2.96%		2.96%	2.96%	2.96%
Long-term debt	$ 997				$ 996
Stated interest rate (as a percent)	2.95%	2.95%	2.95%
0.95% Notes due 2027
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.95%	0.95%	0.95%
0.95% Notes due 2027 | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	0.96%	0.96%	0.96%
Total long-term debt	$ 1,494
1.150% Notes due 2028 (750MM Euro 1.2281)(2)/(750MM Euro 1.1096)(3)
Debt Instrument [Line Items]
Effective interest rate	1.21%	1.21%	1.21%		1.21%	1.21%	1.21%
Long-term debt	$ 915				$ 825
Stated interest rate (as a percent)	1.15%	1.15%	1.15%
Debt Instrument, Face Amount | €		€ 750				€ 750
Foreign currency exchange rate, translation	1.2281	1.2281	1.2281		1.1096	1.1096	1.1096
2.90% Notes due 2028
Debt Instrument [Line Items]
Effective interest rate	2.91%	2.91%	2.91%		2.91%	2.91%	2.91%
Long-term debt	$ 1,495				$ 1,494
Stated interest rate (as a percent)	2.90%	2.90%	2.90%
6.95% Notes due 2029
Debt Instrument [Line Items]
Effective interest rate	7.14%	7.14%	7.14%		7.14%	7.14%	7.14%
Long-term debt	$ 297				$ 297
Stated interest rate (as a percent)	6.95%	6.95%	6.95%
1.30% Notes due 2030
Debt Instrument [Line Items]
Stated interest rate (as a percent)	1.30%	1.30%	1.30%
1.30% Notes due 2030 | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	1.30%	1.30%	1.30%
Total long-term debt	$ 1,743
4.95% Debentures due 2033
Debt Instrument [Line Items]
Effective interest rate	4.95%	4.95%	4.95%		4.95%	4.95%	4.95%
Long-term debt	$ 498				$ 498
Stated interest rate (as a percent)	4.95%	4.95%	4.95%
4.375% Notes due 2033
Debt Instrument [Line Items]
Effective interest rate	4.24%	4.24%	4.24%		4.24%	4.24%	4.24%
Long-term debt	$ 855				$ 855
Stated interest rate (as a percent)	4.375%	4.375%	4.375%
1.650% Notes due 2035 (1.5B Euro 1.2281)(2)/(1.5B Euro 1.1096)(3)
Debt Instrument [Line Items]
Effective interest rate	1.68%	1.68%	1.68%		1.68%	1.68%	1.68%
Long-term debt	$ 1,827				$ 1,649
Stated interest rate (as a percent)	1.65%	1.65%	1.65%
Debt Instrument, Face Amount | €		€ 1,500				€ 1,500
Foreign currency exchange rate, translation	1.2281	1.2281	1.2281		1.1096	1.1096	1.1096
3.55% Notes due 2036
Debt Instrument [Line Items]
Effective interest rate	3.59%	3.59%	3.59%		3.59%	3.59%	3.59%
Long-term debt	$ 989				$ 989
Stated interest rate (as a percent)	3.55%	3.55%	3.55%
5.95% Notes due 2037
Debt Instrument [Line Items]
Effective interest rate	5.99%	5.99%	5.99%		5.99%	5.99%	5.99%
Long-term debt	$ 992				$ 992
Stated interest rate (as a percent)	5.95%	5.95%	5.95%
3.625% Notes due 2037
Debt Instrument [Line Items]
Effective interest rate	3.64%	3.64%	3.64%		3.64%	3.64%	3.64%
Long-term debt	$ 1,488				$ 1,487
Stated interest rate (as a percent)	3.625%	3.625%	3.625%
5.85% Debentures due 2038
Debt Instrument [Line Items]
Effective interest rate	5.85%	5.85%	5.85%		5.85%	5.85%	5.85%
Long-term debt	$ 696				$ 696
Stated interest rate (as a percent)	5.85%	5.85%	5.85%
3.400% Notes due 2038
Debt Instrument [Line Items]
Effective interest rate	3.42%	3.42%	3.42%		3.42%	3.42%	3.42%
Long-term debt	$ 991				$ 991
Stated interest rate (as a percent)	3.40%	3.40%	3.40%
4.50% Debentures due 2040
Debt Instrument [Line Items]
Effective interest rate	4.63%	4.63%	4.63%		4.63%	4.63%	4.63%
Long-term debt	$ 539				$ 539
Stated interest rate (as a percent)	4.50%	4.50%	4.50%
2.10% Notes due 2040
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.10%	2.10%	2.10%
2.10% Notes due 2040 | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	2.14%	2.14%	2.14%
Total long-term debt	$ 986
4.85% Notes due 2041
Debt Instrument [Line Items]
Effective interest rate	4.89%	4.89%	4.89%		4.89%	4.89%	4.89%
Long-term debt	$ 297				$ 297
Stated interest rate (as a percent)	4.85%	4.85%	4.85%
4.50% Notes due 2043
Debt Instrument [Line Items]
Effective interest rate	4.52%	4.52%	4.52%		4.52%	4.52%	4.52%
Long-term debt	$ 496				$ 495
Stated interest rate (as a percent)	4.50%	4.50%	4.50%
3.70% Notes due 2046
Debt Instrument [Line Items]
Effective interest rate	3.74%	3.74%	3.74%		3.74%	3.74%	3.74%
Long-term debt	$ 1,974				$ 1,973
Stated interest rate (as a percent)	3.70%	3.70%	3.70%
3.75% Notes due 2047
Debt Instrument [Line Items]
Effective interest rate	3.76%	3.76%	3.76%		3.76%	3.76%	3.76%
Long-term debt	$ 991				$ 991
Stated interest rate (as a percent)	3.75%	3.75%	3.75%
3.500% Notes due 2048
Debt Instrument [Line Items]
Effective interest rate	3.52%	3.52%	3.52%		3.52%	3.52%	3.52%
Long-term debt	$ 742				$ 742
Stated interest rate (as a percent)	3.50%	3.50%	3.50%
2.250% Notes due 2050
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.25%	2.25%	2.25%
2.250% Notes due 2050 | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	2.29%	2.29%	2.29%
Total long-term debt	$ 984
2.450% Notes due 2060
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.45%	2.45%	2.45%
2.450% Notes due 2060 | Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Effective interest rate	2.49%	2.49%	2.49%
Total long-term debt	$ 1,228
Other
Debt Instrument [Line Items]
Effective interest rate	0.00%	0.00%	0.00%		0.00%	0.00%	0.00%
Long-term debt	$ 7				$ 18