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Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Marketable Securities [Line Items]
Total marketable securities (including securities classified as cash equivalents)	$ 14,082		$ 14,082		$ 15,671
Total Restricted Cash	2,198		2,198		2,173
Available-for-sale securities, due in one year or less	10,146		10,146
Available-for-sale securities, due between one and five years	1,920		1,920
Total available-for-sale securities with contractual maturities	12,066		12,066
Marketable securities classified as cash equivalents	4,247		4,247		8,163
Sales proceeds from investments classified as available-for-sale and sold prior to maturity	1,600	$ 4,500	4,200	$ 5,900
Cash And Cash Equivalents [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	9,088		9,088		7,730
Marketable securities classified as cash equivalents	9,800		9,800		7,500
Cash and Cash Equivalents and Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities	14,032		14,032		15,090
Trading securities	50		50		581
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,953		1,953		5,329
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | Corporate debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	5,999		5,999		6,267
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	4,097		4,097		1,219
Trading securities	50		50		581
Cash and Cash Equivalents and Marketable Securities [Member] | Level 1 [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,983		1,983		2,275
Restricted Cash [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,481		1,481		1,340
Restricted cash, cash equivalents and time deposits	717		717		833
Restricted Cash [Member] | Level 1 [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	$ 1,481		$ 1,481		$ 1,340

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