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Available-for-sale investments (Details) - USD ($) $ in Millions	Jun. 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	$ 38,767	$ 37,911
Gross unrealized gains	222	128
Gross unrealized losses	(67)	(258)
Estimated fair value	38,922	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	7,664	6,681
Gross unrealized gains	9	1
Gross unrealized losses	(12)	(68)
Estimated fair value	7,661	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	226	302
Gross unrealized gains	1	0
Gross unrealized losses	(1)	(3)
Estimated fair value	226	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	2,334	1,784
Gross unrealized gains	27	9
Gross unrealized losses	(8)	(34)
Estimated fair value	2,353	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	9,591	8,476
Gross unrealized gains	56	21
Gross unrealized losses	(10)	(37)
Estimated fair value	9,637	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	9,499	8,793
Gross unrealized gains	88	59
Gross unrealized losses	(18)	(63)
Estimated fair value	9,569	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	1,229	1,079
Gross unrealized gains	8	5
Gross unrealized losses	(2)	(7)
Estimated fair value	1,235	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	1,689	1,968
Gross unrealized gains	1	1
Gross unrealized losses	(8)	(29)
Estimated fair value	1,682	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	1,854	1,731
Gross unrealized gains	2	1
Gross unrealized losses	(3)	(13)
Estimated fair value	1,853	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	2,165	2,782
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	2,165	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	2,382	4,188
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	2,382	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	38,633	37,784
Gross unrealized gains	192	97
Gross unrealized losses	(62)	(254)
Estimated fair value	38,763	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	134	127
Gross unrealized gains	30	31
Gross unrealized losses	(5)	(4)
Estimated fair value	$ 159	$ 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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-Publisher FASB
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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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