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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,751	$ 1,692
Gross Unrealized Gains	7	0
Gross Unrealized Losses	1	11
Estimated Fair Value	1,757	1,681
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,125	1,131
Gross Unrealized Gains	5	0
Gross Unrealized Losses	1	8
Estimated Fair Value	1,129	1,123
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	302
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Estimated Fair Value	303
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109	83
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	1
Estimated Fair Value	110	82
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97	164
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Estimated Fair Value	97	163
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68	115
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Estimated Fair Value	68	114
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40	181
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	40	181
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	7	4
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3	14
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 3	$ 14

X

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