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Marketable Securities Marketable Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Marketable Securities [Line Items]
Cash and Cash Equivalents	$ 12,960	$ 15,238
Marketable securities	11,841	8,163
Restricted Cash	2,218	2,173
Available-for-sale Securities, Due in one year or less	10,957
Available-for-sale Securities, Due between one and five years	5,786
Total available-for-sale securities with contractual maturities	16,743
Sales proceeds from investments classified as available-for-sale and sold prior to maturity	8,500	7,900	$ 5,900
Cash, Cash Equivalents and Restricted Cash	15,160	17,332	$ 21,189	$ 22,042
Cash And Cash Equivalents Line Item [Member]
Marketable Securities [Line Items]
Cash, Cash Equivalents And Time Deposits	6,077	7,730
Available-for-sale Securities	6,883	7,508
Cash And Cash Equivalents Line Item [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	1,158	0
Cash And Cash Equivalents Line Item [Member] | Level 2 [Member] | Corporate Debt [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	2,524	4,071
Cash And Cash Equivalents Line Item [Member] | Level 2 [Member] | Sovereign Debt [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	1,399	1,162
Cash And Cash Equivalents Line Item [Member] | Level 1 [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	1,802	2,275
Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	11,841	7,582
Trading Securities	0	581
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	5,886	5,329
Marketable Securities [Member] | Level 2 [Member] | Corporate Debt [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	3,611	2,196
Marketable Securities [Member] | Level 2 [Member] | Sovereign Debt [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	2,147	57
Trading Securities	0	581
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	197	0
Other Current Assets and Other Assets [Member]
Marketable Securities [Line Items]
Cash, Cash Equivalents And Time Deposits	531	833
Available-for-sale Securities	1,687	1,340
Other Current Assets and Other Assets [Member] | Level 1 [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale Securities	1,687	1,340
Other Current Assets [Member]
Marketable Securities [Line Items]
Restricted Cash	1,613	1,529
Other Assets [Member]
Marketable Securities [Line Items]
Restricted Cash	$ 587	$ 565

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

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