Cash, Cash Equivalents, and Marketable Securities Summary by Major Security Type Cash Cash Equivalents and Marketable Securities Measured at Fair Value on Recurring Basis and Categorized Using Fair Value Hierarchy (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Cash, cash equivalents and marketable securities [Line Items]
Less: Restricted cash, cash equivalents, and marketable securities	[1]	$ (456)	$ (285)
Cash, Cash Equivalents, and Short-term Investments		16,540	19,808
Cash
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		6,126
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		6,126	6,201
Cash, cash equivalents, and marketable securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		16,936
Gross Unrealized Gains		64
Gross Unrealized Losses		(4)
Cash, Cash Equivalents, and Short-term Investments		16,996	20,093
Level 1 Securities | Money market funds
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		6,802
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		6,802	8,025
Level 1 Securities | Equity securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		23
Gross Unrealized Gains		57
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		80	15
Level 2 Securities | Foreign government and agency securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		50
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		50	49
Level 2 Securities | U.S. government and agency securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		3,180
Gross Unrealized Gains		4
Gross Unrealized Losses		(3)
Cash, Cash Equivalents, and Short-term Investments		3,181	5,167
Level 2 Securities | Corporate debt securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		538
Gross Unrealized Gains		2
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		540	477
Level 2 Securities | Asset-backed securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		147
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Cash, Cash Equivalents, and Short-term Investments		146	117
Level 2 Securities | Other fixed income securities
Cash, cash equivalents and marketable securities [Line Items]
Cost or Amortized Cost		70
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Cash, Cash Equivalents, and Short-term Investments		$ 71	$ 42

[1] We are required to pledge or otherwise restrict a portion of our cash, cash equivalents, and marketable securities as collateral for standby and trade letters of credit, guarantees, debt, real estate leases, and amounts due to third-party sellers in certain jurisdictions. We classify cash, cash equivalents, and marketable securities with use restrictions of less than twelve months as “Accounts receivable, net and other” and of twelve months or longer as non-current “Other assets” on our consolidated balance sheets. See “Note 3 — Commitments and Contingencies.”