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Investments - Investments - VIEs and Other Collateral Transactions (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Concentration Risk [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 940 | $ 920
Fair value of securities on deposit | 2,600 | 2,500
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Concentration Risk [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Commitments | 733 | 0
U.S. Treasuries |  |
Concentration Risk [Line Items] |  |
Pledged collateral | $ 46 | $ 104

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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- Definition Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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