Cash, Cash Equivalents and Current Marketable Securities - Cash and Cash Equivalent Composition (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash Equivalents	$ 17,824	$ 18,972	$ 13,732	$ 14,523
Current Marketable Securities	472	22,935
Held-to-maturity Securities
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	12,986	29,488
Unrecognized Gain		0
Unrecognized Loss		(1)
Estimated Fair Value	12,986	29,487
Cash Equivalents	12,880	18,972
Current Marketable Securities	106	10,516
Held-to-maturity Securities | Cash
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	2,929	1,979
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	2,929	1,979
Cash Equivalents	2,929	1,979
Current Marketable Securities	0	0
Held-to-maturity Securities | U.S. Gov't Securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	0	10,832
Unrecognized Gain		0
Unrecognized Loss		(1)
Estimated Fair Value	0	10,831
Cash Equivalents	0	2,249
Current Marketable Securities	0	8,583
Held-to-maturity Securities | Other Sovereign Securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	279	1,299
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	279	1,299
Cash Equivalents	219	120
Current Marketable Securities	60	1,179
Held-to-maturity Securities | U.S. Reverse repurchase agreements
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	4,025	6,103
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	4,025	6,103
Cash Equivalents	4,025	6,103
Current Marketable Securities	0	0
Held-to-maturity Securities | Other Reverse repurchase agreements
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	0	240
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	0	240
Cash Equivalents	0	240
Current Marketable Securities	0	0
Held-to-maturity Securities | Corporate debt securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	289	754
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	289	754
Cash Equivalents	244	0
Current Marketable Securities	45	754
Held-to-maturity Securities | Money market funds
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	4,288	7,187
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	4,288	7,187
Cash Equivalents	4,288	7,187
Current Marketable Securities	0	0
Held-to-maturity Securities | Time deposits(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Carrying Amount	1,176	1,094
Unrecognized Gain		0
Unrecognized Loss		0
Estimated Fair Value	1,176	1,094
Cash Equivalents	1,175	1,094
Current Marketable Securities	1	0
Available-for-sale Securities
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash Equivalents	4,944	0
Current Marketable Securities	366	12,419
Available-for-sale Securities, Amortized Cost Basis	5,310	12,178
Unrealized Gain		304
Unrealized Loss		(63)
Available-for-sale Securities	5,310	12,419
Available-for-sale Securities | U.S. Gov't Securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash Equivalents	4,833	0
Current Marketable Securities	31	10,231
Available-for-sale Securities, Amortized Cost Basis	4,864	10,277
Unrealized Gain		5
Unrealized Loss		(51)
Available-for-sale Securities	4,864	10,231
Available-for-sale Securities | Other Sovereign Securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash Equivalents	80
Current Marketable Securities	106	90
Available-for-sale Securities, Amortized Cost Basis	186	90
Unrealized Gain		0
Unrealized Loss		0
Available-for-sale Securities	186	90
Available-for-sale Securities | Corporate debt securities(1)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash Equivalents	31	0
Current Marketable Securities	229	1,766
Available-for-sale Securities, Amortized Cost Basis	260	1,777
Unrealized Gain		1
Unrealized Loss		(12)
Available-for-sale Securities	$ 260	1,766
Available-for-sale Securities | Equity investments
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Current Marketable Securities		332
Available-for-sale Securities, Amortized Cost Basis		34
Unrealized Gain		298
Unrealized Loss		0
Available-for-sale Securities		$ 332