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Marketable Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Marketable Securities [Line Items]
Total cash and cash equivalents	$ 16,598		$ 16,598		$ 12,574
Total restricted cash	2,322		2,322		1,913
Due in one year or less	9,002		9,002
Due between one and five years	5,360		5,360
Total available-for-sale securities with contractual maturities	14,362		14,362
Sale proceeds from investments classified as available-for-sale and sold prior to maturity	750	$ 1,600	1,400	$ 4,200
Cash and Cash Equivalents [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	6,758		6,758		5,692
Available-for-sale securities	9,840		9,840		6,882
Cash and Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,179		1,179		1,158
Cash and Cash Equivalents [Member] | Level 2 [Member] | Corporate debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,903		2,903		2,524
Cash and Cash Equivalents [Member] | Level 2 [Member] | Sovereign debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,641		1,641		1,399
Cash and Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	4,117		4,117		1,801
Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities	9,133		9,133		11,841
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	4,045		4,045		5,886
Marketable Securities [Member] | Level 2 [Member] | Corporate debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	3,606		3,606		3,611
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member]
Marketable Securities [Line Items]
Available-for-sale securities	494		494		197
Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	988		988		2,147
Other Current Assets and Other Assets [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	207		207		248
Other Current Assets and Other Assets [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,115		2,115		1,665
Other Current Assets and Other Assets [Member] | Level 1 [Member] | Money market funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	$ 2,115		$ 2,115		$ 1,665

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Sum of cash, cash equivalents (other than available-for-sale and trading securities) and time deposits.

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