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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,864	$ 1,941
Gross unrealized gains	47	7
Gross unrealized losses	5	2
Estimated Fair Value	1,906	1,946
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,108	1,174
Gross unrealized gains	33	5
Gross unrealized losses	2	1
Estimated Fair Value	1,139	1,178
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	433	420
Gross unrealized gains	9	1
Gross unrealized losses	3	1
Estimated Fair Value	439	420
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	174	78
Gross unrealized gains	2	0
Gross unrealized losses	0	0
Estimated Fair Value	176	78
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136	126
Gross unrealized gains	3	1
Gross unrealized losses	0	0
Estimated Fair Value	139	127
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7	1
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	7	1
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4	86
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	4	86
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2	49
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	$ 2	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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