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Marketable Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Marketable Securities [Line Items]
Total cash and cash equivalents	$ 12,864		$ 12,960
Total restricted cash	2,700		2,218
Due in one year or less	8,673
Due between one and five years	5,474
Total available-for-sale securities with contractual maturities	14,147
Sale proceeds from investments classified as available-for-sale and sold prior to maturity	626	$ 2,600
Cash and Cash Equivalents [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	6,857		6,077
Available-for-sale securities	6,007		6,883
Cash and Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,128		1,158
Cash and Cash Equivalents [Member] | Level 2 [Member] | Corporate debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,459		2,524
Cash and Cash Equivalents [Member] | Level 2 [Member] | Sovereign debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	652		1,399
Cash and Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,768		1,802
Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities	10,260		11,841
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	4,053		5,886
Marketable Securities [Member] | Level 2 [Member] | Corporate debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	3,974		3,611
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member]
Marketable Securities [Line Items]
Available-for-sale securities	370		197
Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,863		2,147
Other Current Assets and Other Assets [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	547		531
Other Current Assets and Other Assets [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,153		1,687
Other Current Assets and Other Assets [Member] | Level 1 [Member] | Money market funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	$ 2,153		$ 1,687

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