Fair Value Measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions		Jun. 28, 2015	Dec. 28, 2014	Jun. 29, 2014	Dec. 29, 2013
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		$ 0
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Securities - Estimated Fair Value	[1]	3,105
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		10,639	$ 14,523	$ 14,236	$ 20,927
Marketable Securities, Current		23,315	$ 18,566
Held-to-maturity Securities
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		30,849
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		4
Held-to-maturity Securities - Estimated Fair Value		30,853
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		10,639
Marketable Securities, Current		20,210
Held-to-maturity Securities | Cash
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		1,855
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value		1,855
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		1,855
Held-to-maturity Securities | U.S. Gov't Securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	16,361
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		3
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	16,364
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	0
Marketable Securities, Current	[2]	16,361
Held-to-maturity Securities | Other Sovereign Securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	2,034
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	2,034
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	525
Marketable Securities, Current	[2]	1,509
Held-to-maturity Securities | U.S. Reverse repurchase agreements(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	4,818
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	4,818
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	4,818
Held-to-maturity Securities | Other Reverse repurchase agreements(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	929
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	929
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	929
Held-to-maturity Securities | Corporate debt securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	2,605
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		1
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	2,606
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	265
Marketable Securities, Current	[2]	2,340
Held-to-maturity Securities | Money market funds
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		1,354
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value		1,354
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		1,354
Held-to-maturity Securities | Time deposits(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	893
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	893
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	893
Available-for-sale Securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	3,120
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(15)
Available-for-sale Securities - Estimated Fair Value	[3]	3,105
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[3]	0
Marketable Securities, Current	[3]	3,105
Available-for-sale Securities | U.S. Gov't Securities(1)
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	2,190
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(9)
Available-for-sale Securities - Estimated Fair Value	[3]	2,181
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		0
Marketable Securities, Current	[3]	2,181
Available-for-sale Securities | Corporate debt securities(1)
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	930
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(6)
Available-for-sale Securities - Estimated Fair Value	[3]	924
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		0
Marketable Securities, Current	[3]	$ 924

[1] Classified as current marketable securities

[2] Held to maturity investments are reported at amortized costs and gains or losses are reported in earnings

[3] Available for sale securities are reported at fair value with unrealized gains and losses reported net of taxes in other comprehensive income.