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Short-Term Debt - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Accrued interest payable on short-term debt	$ 5,000,000	$ 5,000,000	$ 3,000,000
Average balance of short-term debt	1,040,000,000	920,000,000
Committed line of credit	10,000,000	10,000,000
Fair value of mortgage backed securities securing loan (in excess)	7,000,000	7,000,000
Committed line of credit with financial institutions, outstanding	0	0	0
Residential loans
Short-term Debt [Line Items]
Loan pledged as collateral	645,000,000	645,000,000	534,000,000
Residential
Short-term Debt [Line Items]
Securities pledged as collateral	563,000,000	563,000,000	$ 363,000,000
Convertible Debt | Convertible Senior Notes Due 2018
Short-term Debt [Line Items]
Convertible notes	$ 288,000,000	$ 288,000,000
Debt Instrument interest rate (as a percent)	4.625%	4.625%
Unamortized deferred issuance costs	$ 2,000,000	$ 2,000,000
Amount of debt repurchased	37,000,000	37,000,000
Gain (loss) on extinguishment of debt	(1,000,000)
Accrued interest payable on short-term debt	$ 2,000,000	$ 2,000,000

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- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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