Fair Value Measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions		Sep. 27, 2015	Dec. 28, 2014	Sep. 28, 2014	Dec. 29, 2013
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Estimated Fair Value	[1]	$ 5,269
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		13,639	$ 14,523	$ 13,818	$ 20,927
Marketable securities		23,667	$ 18,566
Held-to-maturity Securities
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		32,037
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		5
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value		32,042
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		13,639
Marketable securities		18,398
Held-to-maturity Securities | Cash
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		1,976
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		1,976
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		1,976
Held-to-maturity Securities | U.S. Gov't Securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	15,694
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		5
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities - Estimated Fair Value	[2]	15,699
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	1,700
Marketable securities	[2]	13,994
Held-to-maturity Securities | Other Sovereign Securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	2,737
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]	2,737
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	1,192
Marketable securities	[2]	1,545
Held-to-maturity Securities | U.S. Reverse repurchase agreements(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	3,015
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]	3,015
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	3,015
Held-to-maturity Securities | Other Reverse repurchase agreements(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	2,179
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]	2,179
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	2,179
Held-to-maturity Securities | Corporate debt securities(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	4,237
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]	4,237
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	1,378
Marketable securities	[2]	2,859
Held-to-maturity Securities | Money market funds
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount		1,358
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		1,358
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		1,358
Held-to-maturity Securities | Time deposits(1)
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities - Carrying Amount	[2]	841
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]	841
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[2]	841
Available-for-sale Securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	5,257
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	16
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	(4)
Available-for-sale Securities - Estimated Fair Value	[3]	5,269
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents	[3]	0
Marketable securities	[3]	5,269
Available-for-sale Securities | U.S. Gov't Securities(1)
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	4,255
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	(1)
Available-for-sale Securities - Estimated Fair Value	[3]	4,268
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		0
Marketable securities	[3]	4,268
Available-for-sale Securities | Corporate debt securities(1)
Available-for-sale Securities [Abstract]
Available-for-sale Securities - Carrying Amount	[3]	1,002
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	(3)
Available-for-sale Securities - Estimated Fair Value	[3]	1,001
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Cash and Cash Equivalents		0
Marketable securities	[3]	$ 1,001

[1] Classified as current marketable securities

[2] Held to maturity investments are reported at amortized cost 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.