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Investments - Schedule (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt securities
Amortized cost	$ 9,844,000,000	$ 8,206,000,000
Gross unrealized gains	1,000,000	28,000,000
Gross unrealized losses	0	0
Fair values	9,845,000,000	8,234,000,000
U.S. Treasury notes [Member]
Debt securities
Amortized cost	129,000,000	359,000,000
Gross unrealized gains	1,000,000	1,000,000
Gross unrealized losses	0	0
Fair values	130,000,000	360,000,000
U.S. Treasury bills [Member]
Debt securities
Amortized cost	4,948,000,000	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	4,948,000,000	0
Corporate debt securities - Financial [Member]
Debt securities
Amortized cost	0	1,108,000,000
Gross unrealized gains	0	13,000,000
Gross unrealized losses	0	0
Fair values	0	1,121,000,000
Corporate debt securities - Industrial [Member]
Debt securities
Amortized cost	0	824,000,000
Gross unrealized gains	0	10,000,000
Gross unrealized losses	0	0
Fair values	0	834,000,000
Corporate debt securities - Other [Member]
Debt securities
Amortized cost	0	195,000,000
Gross unrealized gains	0	3,000,000
Gross unrealized losses	0	0
Fair values	0	198,000,000
Residential mortgage-backed securities [Member]
Debt securities
Amortized cost	0	181,000,000
Gross unrealized gains	0	1,000,000
Gross unrealized losses	0	0
Fair values	0	182,000,000
Money market mutual funds [Member]
Debt securities
Amortized cost	4,765,000,000	5,250,000,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	4,765,000,000	5,250,000,000
Other short-term interest-bearing securities [Member]
Debt securities
Amortized cost	2,000,000	289,000,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 2,000,000	$ 289,000,000

X

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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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