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Available-for-sale investments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	$ 40,779	$ 37,911
Gross unrealized gains	245	128
Gross unrealized losses	(75)	(258)
Fair value	40,949	37,781
U.S. Treasury securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	8,029	6,681
Gross unrealized gains	6	1
Gross unrealized losses	(17)	(68)
Fair value	8,018	6,614
Other government-related debt securities - U.S. [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	225	302
Gross unrealized gains	0	0
Gross unrealized losses	(1)	(3)
Fair value	224	299
Other government-related debt securities - Foreign and other [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	2,634	1,784
Gross unrealized gains	41	9
Gross unrealized losses	(4)	(34)
Fair value	2,671	1,759
Corporate debt securities - Financial [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	10,198	8,476
Gross unrealized gains	63	21
Gross unrealized losses	(7)	(37)
Fair value	10,254	8,460
Corporate debt securities - Industrial [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	9,829	8,793
Gross unrealized gains	94	59
Gross unrealized losses	(17)	(63)
Fair value	9,906	8,789
Corporate debt securities - Other [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	1,251	1,079
Gross unrealized gains	12	5
Gross unrealized losses	(2)	(7)
Fair value	1,261	1,077
Residential mortgage-backed securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	2,212	1,968
Gross unrealized gains	2	1
Gross unrealized losses	(10)	(29)
Fair value	2,204	1,940
Other mortgage- and asset-backed securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	2,071	1,731
Gross unrealized gains	0	1
Gross unrealized losses	(4)	(13)
Fair value	2,067	1,719
Money market mutual funds [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	2,455	2,782
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	2,455	2,782
Other short-term interest-bearing securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	1,746	4,188
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	1,746	4,188
Total interest-bearing securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	40,650	37,784
Gross unrealized gains	218	97
Gross unrealized losses	(62)	(254)
Fair value	40,806	37,627
Equity securities [Member]
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
Amortized cost	129	127
Gross unrealized gains	27	31
Gross unrealized losses	(13)	(4)
Fair value	$ 143	$ 154

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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