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Marketable Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Marketable Securities [Line Items]
Total cash and cash equivalents	$ 15,512	$ 12,574
Total restricted cash	2,336	1,913
Due in one year or less	8,539
Due between one and five years	4,875
Total available-for-sale securities with contractual maturities	13,414
Sales proceeds from investments classified as available-for-sale and sold prior to maturity	5,600	8,500	$ 7,900
Total	17,848	15,160	17,332	$ 21,189
Continuing Operations [Member]
Marketable Securities [Line Items]
Total cash and cash equivalents	15,512	12,574
Total	17,848	14,487	$ 16,588
Cash And Cash Equivalents [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	6,962	5,692
Available-for-sale securities	8,550	6,882
Cash And Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	750	1,158
Cash And Cash Equivalents [Member] | Level 2 [Member] | Corporate Debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	3,032	2,524
Cash And Cash Equivalents [Member] | Level 2 [Member] | Sovereign Debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	1,954	1,399
Cash And Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,814	1,801
Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities	8,313	11,841
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member]
Marketable Securities [Line Items]
Available-for-sale securities	3,310	5,886
Marketable Securities [Member] | Level 2 [Member] | Corporate Debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	3,665	3,611
Marketable Securities [Member] | Level 2 [Member] | Sovereign Debt [Member]
Marketable Securities [Line Items]
Available-for-sale securities	703	2,147
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member]
Marketable Securities [Line Items]
Available-for-sale securities	635	197
Other Current Assets and Other Assets [Member]
Marketable Securities [Line Items]
Cash, cash equivalents and time deposits	219	248
Other Current Assets and Other Assets [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Available-for-sale securities	2,117	1,665
Other Current Assets [Member] | Continuing Operations [Member]
Marketable Securities [Line Items]
Total restricted cash	1,745	1,382
Other Assets [Member] | Continuing Operations [Member]
Marketable Securities [Line Items]
Total restricted cash	$ 591	$ 531

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