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Investments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 21,072	$ 29,064
Gross unrealized gains	67	1
Gross unrealized losses	(22)	(341)
Fair values	21,117	28,724
U.S. Treasury notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,709	2,710
Gross unrealized gains	10	0
Gross unrealized losses	(2)	(47)
Fair values	2,717	2,663
U.S. Treasury bills [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,497	8,191
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	3,497	8,191
Other government-related debt securities - U.S. [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	112	112
Gross unrealized gains	0	0
Gross unrealized losses	0	(2)
Fair values	112	110
Other government-related debt securities - Foreign and other [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	962	972
Gross unrealized gains	18	1
Gross unrealized losses	(3)	(41)
Fair values	977	932
Corporate debt securities - Financial [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,755	2,778
Gross unrealized gains	19	0
Gross unrealized losses	(1)	(81)
Fair values	2,773	2,697
Corporate debt securities - Industrial [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,400	2,603
Gross unrealized gains	14	0
Gross unrealized losses	(6)	(99)
Fair values	2,408	2,504
Corporate debt securities - Other [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	558	583
Gross unrealized gains	4	0
Gross unrealized losses	0	(21)
Fair values	562	562
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,335	1,458
Gross unrealized gains	2	0
Gross unrealized losses	(4)	(36)
Fair values	1,333	1,422
Other mortgage- and asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	469	483
Gross unrealized gains	0	0
Gross unrealized losses	(6)	(14)
Fair values	463	469
Money market mutual funds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,886	5,659
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	3,886	5,659
Other short-term interest-bearing securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,389	3,515
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 2,389	$ 3,515

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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