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Debt Obligations and Commitments (Schedule of Long and Short-Term Debt Contractual Commitments) (Details)	Dec. 26, 2020 USD ($)	Dec. 26, 2020 EUR (€)	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Debt Instrument [Line Items]
Debt, Current	$ 3,780,000,000		$ 2,920,000,000
Notes due	200,000,000		2,200,000,000
Long-term Debt	43,728,000,000		31,996,000,000
Long-Term Debt Obligations	40,370,000,000		29,148,000,000
Debt Instrument, Unamortized Discount	$ 260,000,000		$ 163,000,000
Debt Instrument, Face Amount				$ 732,000,000
Other Borrowings Short-term [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.70%	1.70%	6.40%
Other borrowings	$ 26,000,000		$ 72,000,000
Commercial Paper	$ 396,000,000		0
Commercial Paper
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.20%	0.20%
Notes Due 2027 [Member] \| Two Point Six Two Five Percent Notes Due 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.625%	2.625%
Debt Instrument, Face Amount	$ 500,000,000
Current Maturities Of Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	3,358,000,000		2,848,000,000
Long-term Debt, Current Maturities	$ (3,358,000,000)		$ (2,848,000,000)
Notes Due 2031 [Member] \| One Point Four Percent Notes Due 2031
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.40%	1.40%
Debt Instrument, Face Amount	$ 750,000,000
Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.00%	0.00%
Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			2.70%
Notes due	$ 0		$ 2,840,000,000
Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.20%	2.20%	2.40%
Notes due	$ 3,356,000,000		$ 3,276,000,000
Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.50%	2.50%	2.70%
Notes due	$ 3,867,000,000		$ 3,831,000,000
Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.50%	1.50%	2.80%
Notes due	$ 3,017,000,000		$ 1,272,000,000
Notes Due 2023 [Member] \| Point Four Percent Notes Due 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.40%	0.40%
Debt Instrument, Face Amount	$ 750,000,000
Notes Due 2023 [Member] \| Point Seven Five Percent Notes Due 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.75%	0.75%
Debt Instrument, Face Amount	$ 1,000,000,000
Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.10%	2.10%	3.40%
Notes due	$ 3,067,000,000		$ 1,839,000,000
Notes Due 2024 [Member] \| Zero Point Two Five Percent Notes Due 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.25%	0.25%
Debt Instrument, Face Amount \| €		€ 1,000,000,000
Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.70%	2.70%	3.10%
Notes due	$ 3,227,000,000		$ 1,691,000,000
Notes Due 2025 \| Two Point Two Five Percent Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%	2.25%
Debt Instrument, Face Amount	$ 1,500,000,000
Less: Current Maturities Of Long Term Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	3,358,000,000		2,848,000,000
Long-term Debt, Current Maturities	$ (3,358,000,000)		$ (2,848,000,000)
Notes Due 2040 [Member] \| Three Point Five Percent Notes Due 2040
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
Debt Instrument, Face Amount	$ 750,000,000
Notes Due 2030 \| Two Point Seven Five Percent Notes Due 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%
Debt Instrument, Face Amount	$ 1,500,000,000
Notes Due 2030 \| One Point Six Two Five Percent Notes Due 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.625%	1.625%
Debt Instrument, Face Amount	$ 1,000,000,000
Notes Due 2032 \| Point Four Percent Notes Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.40%	0.40%
Debt Instrument, Face Amount \| €		€ 750,000,000
Notes Due 2050 \| Three Point Six Two Five Percent Notes Due 2050
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.625%	3.625%
Debt Instrument, Face Amount	$ 1,500,000,000
Notes Due 2050 \| One Point Zero Five Percent Notes Due 2050
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.05%	1.05%
Debt Instrument, Face Amount \| €		€ 750,000,000
Notes Due 2060 \| Three Point Eight Seven Five Percent Notes Due 2060
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Debt Instrument, Face Amount	$ 750,000,000
Notes Due 2028 \| Zero Point Five Percent Notes Due 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.50%	0.50%
Debt Instrument, Face Amount \| €		€ 1,000,000,000
Notes due 2025-2060
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.90%	2.90%	3.40%
Notes due	$ 27,165,000,000		$ 17,219,000,000
Other Debt Instruments due 2020-2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.30%	1.30%	1.30%
Other notes due	$ 29,000,000		$ 28,000,000