Fair Value Measurements - Financial Liabilities not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 29, 2020	Dec. 29, 2019
Financial Liabilities
Current Debt	$ 2,190	$ 1,202
Non-Current Debt
Non-Current Debt	25,393	$ 26,494
Carrying Amount
Financial Liabilities
Current Debt	2,190
Non-Current Debt
Non-Current Debt	25,393
Estimated Fair Value
Financial Liabilities
Current Debt	2,234
Non-Current Debt
Non-Current Debt	$ 29,410
3.55% Notes due 2021
Non-Current Debt
Stated interest rate (as a percent)	3.55%
3.55% Notes due 2021 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 449
3.55% Notes due 2021 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 463
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	$ 356
0.250% Notes due 2022 (1B Euro 1.0980)
Non-Current Debt
Stated interest rate (as a percent)	0.25%
0.250% Notes due 2022 (1B Euro 1.0980) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,097
0.250% Notes due 2022 (1B Euro 1.0980) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,096
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	$ 1,019
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	$ 301
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	$ 804
3.375% Notes due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 875
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	$ 512
0.650% Notes due 2024 (750MM Euro 1.0980)
Non-Current Debt
Stated interest rate (as a percent)	0.65%
0.650% Notes due 2024 (750MM Euro 1.0980) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 821
0.650% Notes due 2024 (750MM Euro 1.0980) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 826
5.50% Notes due 2024 (500 MM GBP 1.2023)
Non-Current Debt
Stated interest rate (as a percent)	5.50%
5.50% Notes due 2024 (500 MM GBP 1.2023) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 597
5.50% Notes due 2024 (500 MM GBP 1.2023) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 697
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	$ 796
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	$ 1,993
2.45% Notes due 2026 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 2,112
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	$ 1,074
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	$ 1,640
1.150% Notes due 2028 (750MM Euro 1.0980)
Non-Current Debt
Stated interest rate (as a percent)	1.15%
1.150% Notes due 2028 (750MM Euro 1.0980) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 817
1.150% Notes due 2028 (750MM Euro 1.0980) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 833
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	$ 419
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	$ 661
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	$ 856
4.375% Notes due 2033 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,099
1.650% Notes due 2035 (1.5B Euro 1.0980)
Non-Current Debt
Stated interest rate (as a percent)	1.65%
1.650% Notes due 2035 (1.5B Euro 1.0980) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,631
1.650% Notes due 2035 (1.5B Euro 1.0980) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,699
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	$ 1,172
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	$ 1,477
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	$ 1,487
3.625% Notes due 2037 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,719
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	$ 1,144
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	$ 1,072
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	$ 689
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	$ 432
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	$ 696
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	$ 1,973
3.70% Notes due 2046 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 2,406
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	$ 1,230
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	890
Other | Carrying Amount
Non-Current Debt
Non-Current Debt	5
Other | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 5