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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,721	$ 1,941
Gross unrealized gains	50	7
Gross unrealized losses	2	2
Estimated Fair Value	1,769	1,946
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,007	1,174
Gross unrealized gains	35	5
Gross unrealized losses	1	1
Estimated Fair Value	1,041	1,178
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	408	420
Gross unrealized gains	10	1
Gross unrealized losses	1	1
Estimated Fair Value	417	420
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	166	78
Gross unrealized gains	2	0
Gross unrealized losses	0	0
Estimated Fair Value	168	78
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	133	126
Gross unrealized gains	3	1
Gross unrealized losses	0	0
Estimated Fair Value	136	127
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5	1
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	5	1
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2	86
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	$ 2	86
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		49
Gross unrealized gains		0
Gross unrealized losses		0
Estimated Fair Value		49
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		7
Gross unrealized gains		0
Gross unrealized losses		0
Estimated Fair Value		$ 7

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