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Investments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Sale of securities receivable	$ 1,100
Amortized cost	20,138	$ 29,064
Gross unrealized gains	89	1
Gross unrealized losses	0	(341)
Fair values	20,227	28,724
U.S. Treasury notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,164	2,710
Gross unrealized gains	3	0
Gross unrealized losses	0	(47)
Fair values	1,167	2,663
U.S. Treasury bills [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,494	8,191
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	2,494	8,191
Other government-related debt securities - U.S. [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	0	112
Gross unrealized gains	0	0
Gross unrealized losses	0	(2)
Fair values	0	110
Other government-related debt securities - Foreign and other [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	896	972
Gross unrealized gains	29	1
Gross unrealized losses	0	(41)
Fair values	925	932
Corporate debt securities - Financial [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,116	2,778
Gross unrealized gains	24	0
Gross unrealized losses	0	(81)
Fair values	2,140	2,697
Corporate debt securities - Industrial [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,002	2,603
Gross unrealized gains	23	0
Gross unrealized losses	0	(99)
Fair values	2,025	2,504
Corporate debt securities - Other [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	531	583
Gross unrealized gains	6	0
Gross unrealized losses	0	(21)
Fair values	537	562
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	512	1,458
Gross unrealized gains	4	0
Gross unrealized losses	0	(36)
Fair values	516	1,422
Other mortgage- and asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	43	483
Gross unrealized gains	0	0
Gross unrealized losses	0	(14)
Fair values	43	469
Money market mutual funds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	8,017	5,659
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	8,017	5,659
Other short-term interest-bearing securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,363	3,515
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 2,363	$ 3,515

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