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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments
Amortized Cost	$ 1,761	$ 1,808
Gross Unrealized Gains	1	0
Gross Unrealized Losses	4	7
Estimated Fair Value	1,758	1,801
Corporate debt securities
Investments
Amortized Cost	1,180	1,189
Gross Unrealized Gains	1	0
Gross Unrealized Losses	2	5
Estimated Fair Value	1,179	1,184
GSEs
Investments
Amortized Cost	232	212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	231	211
Municipal securities
Investments
Amortized Cost	143	186
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	142	185
U.S. treasury notes
Investments
Amortized Cost	84	78
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	84	78
Asset-backed securities
Investments
Amortized Cost	69	63
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	69	63
Certificates of deposit
Investments
Amortized Cost	53	80
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 53	$ 80

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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