Fair Value Measurements - Financial Liabilities not Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 27, 2020	Dec. 29, 2019
Financial Liabilities
Current Debt	$ 5,078	$ 1,202
Non-Current Debt
Non-Current Debt	32,680	$ 26,494
Senior notes
Non-Current Debt
Non-Current Debt	7,500
Carrying Amount
Financial Liabilities
Current Debt	5,078
Non-Current Debt
Non-Current Debt	32,680
Estimated Fair Value
Financial Liabilities
Current Debt	5,093
Non-Current Debt
Non-Current Debt	$ 37,812
2.45% Notes due 2021
Non-Current Debt
Stated interest rate (as a percent)	2.45%
2.45% Notes due 2021 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 350
2.45% Notes due 2021 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 358
0.250% Notes due 2022 (1B Euro 1.1641)
Non-Current Debt
Stated interest rate (as a percent)	0.25%
0.250% Notes due 2022 (1B Euro 1.1641) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,163
0.250% Notes due 2022 (1B Euro 1.1641) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,172
2.25% Notes due 2022
Non-Current Debt
Stated interest rate (as a percent)	2.25%
2.25% Notes due 2022 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 998
2.25% Notes due 2022 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,025
6.73% Debentures due 2023
Non-Current Debt
Stated interest rate (as a percent)	6.73%
6.73% Debentures due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 250
6.73% Debentures due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 299
3.375% Notes due 2023
Non-Current Debt
Stated interest rate (as a percent)	3.375%
3.375% Notes due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 803
3.375% Notes due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 881
2.05% Notes due 2023
Non-Current Debt
Stated interest rate (as a percent)	2.05%
2.05% Notes due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 499
2.05% Notes due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 518
0.650% Notes due 2024 (750MM Euro 1.1641)
Non-Current Debt
Stated interest rate (as a percent)	0.65%
0.650% Notes due 2024 (750MM Euro 1.1641) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 870
0.650% Notes due 2024 (750MM Euro 1.1641) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 899
5.50% Notes due 2024 (500 MM GBP 1.2757)
Non-Current Debt
Stated interest rate (as a percent)	5.50%
5.50% Notes due 2024 (500 MM GBP 1.2757) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 634
5.50% Notes due 2024 (500 MM GBP 1.2757) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 768
2.625% Notes due 2025
Non-Current Debt
Stated interest rate (as a percent)	2.625%
2.625% Notes due 2025 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 748
2.625% Notes due 2025 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 813
0.550 Notes due 2025
Non-Current Debt
Stated interest rate (as a percent)	0.55%
0.55% Notes due 2025 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 996
0.55% Notes due 2025 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 990
2.45% Notes due 2026
Non-Current Debt
Stated interest rate (as a percent)	2.45%
2.45% Notes due 2026 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,994
2.45% Notes due 2026 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 2,180
2.95% Notes due 2027
Non-Current Debt
Stated interest rate (as a percent)	2.95%
2.95% Notes due 2027 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 997
2.95% Notes due 2027 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,119
0.95% Notes due 2027
Non-Current Debt
Stated interest rate (as a percent)	0.95%
0.95% Notes due 2027 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,494
0.95% Notes due 2027 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,510
2.90% Notes due 2028
Non-Current Debt
Stated interest rate (as a percent)	2.90%
2.90% Notes due 2028 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,494
2.90% Notes due 2028 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,680
1.150% Notes due 2028 (750MM Euro 1.1641)
Non-Current Debt
Stated interest rate (as a percent)	1.15%
1.150% Notes due 2028 (750MM Euro 1.1641) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 867
1.150% Notes due 2028 (750MM Euro 1.1641) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 960
6.95% Notes due 2029
Non-Current Debt
Stated interest rate (as a percent)	6.95%
6.95% Notes due 2029 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 297
6.95% Notes due 2029 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 441
1.300% Notes due 2030
Non-Current Debt
Stated interest rate (as a percent)	1.30%
4.95% Debentures due 2033
Non-Current Debt
Stated interest rate (as a percent)	4.95%
4.95% Debentures due 2033 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 498
4.95% Debentures due 2033 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 690
4.375% Notes due 2033
Non-Current Debt
Stated interest rate (as a percent)	4.375%
4.375% Notes due 2033 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 855
4.375% Notes due 2033 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,128
1.650% Notes due 2035 (1.5B Euro 1.1641)
Non-Current Debt
Stated interest rate (as a percent)	1.65%
1.650% Notes due 2035 (1.5B Euro 1.1641) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,731
1.650% Notes due 2035 (1.5B Euro 1.1641) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 2,101
3.55% Notes due 2036
Non-Current Debt
Stated interest rate (as a percent)	3.55%
3.55% Notes due 2036 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 989
3.55% Notes due 2036 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,197
5.95% Notes due 2037
Non-Current Debt
Stated interest rate (as a percent)	5.95%
5.95% Notes due 2037 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 992
5.95% Notes due 2037 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,536
3.625% Notes due 2037
Non-Current Debt
Stated interest rate (as a percent)	3.625%
3.625% Notes due 2037 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,488
3.625% Notes due 2037 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,819
3.40% Notes due 2038
Non-Current Debt
Stated interest rate (as a percent)	3.40%
3.40% Notes due 2038 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 991
3.40% Notes due 2038 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,176
5.85% Debentures due 2038
Non-Current Debt
Stated interest rate (as a percent)	5.85%
5.85% Debentures due 2038 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 696
5.85% Debentures due 2038 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,094
4.50% Debentures due 2040
Non-Current Debt
Stated interest rate (as a percent)	4.50%
4.50% Debentures due 2040 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 539
4.50% Debentures due 2040 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 737
2.10% Notes due 2040
Non-Current Debt
Stated interest rate (as a percent)	2.10%
2.10% Notes due 2040 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 986
2.10% Notes due 2040 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 991
4.85% Notes due 2041
Non-Current Debt
Stated interest rate (as a percent)	4.85%
4.85% Notes due 2041 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 297
4.85% Notes due 2041 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 421
4.50% Notes due 2043
Non-Current Debt
Stated interest rate (as a percent)	4.50%
4.50% Notes due 2043 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 495
4.50% Notes due 2043 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 689
3.70% Notes due 2046
Non-Current Debt
Stated interest rate (as a percent)	3.70%
3.70% Notes due 2046 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,974
3.70% Notes due 2046 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 2,478
3.75% Notes due 2047
Non-Current Debt
Stated interest rate (as a percent)	3.75%
3.75% Notes due 2047 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 991
3.75% Notes due 2047 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,258
3.50% Notes due 2048
Non-Current Debt
Stated interest rate (as a percent)	3.50%
3.50% Notes due 2048 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 742
3.50% Notes due 2048 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 921
2.250% Notes due 2050
Non-Current Debt
Stated interest rate (as a percent)	2.25%
2.450% Notes due 2060
Non-Current Debt
Stated interest rate (as a percent)	2.45%
2.450% Notes due 2060 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,228
2.450% Notes due 2060 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	1,230
Other | Carrying Amount
Non-Current Debt
Non-Current Debt	7
Other | Estimated Fair Value
Non-Current Debt
Non-Current Debt	10
1.30% Notes due 2030 | Carrying Amount
Non-Current Debt
Non-Current Debt	1,743
1.30% Notes due 2030 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	1,739
2.25% Notes due 2050 | Carrying Amount
Non-Current Debt
Non-Current Debt	984
2.25% Notes due 2050 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 984