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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | $ 1,926 | $ 1,737
Collateral held under securities lending agreements | 1,926 | 1,737
Maturity Overnight [Member] | Cash and Cash Equivalents [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | 756 | 828
Maturity Overnight [Member] | U.S. Treasury and agency |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | 64 | 36
Maturity Overnight [Member] | Foreign [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | 795 | 712
Maturity Overnight [Member] | Corporate securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | 15 | 0
Maturity Overnight [Member] | Mortgage-backed securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | 45 | 74
Maturity Overnight [Member] | Equity securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities lending collateral | $ 251 | $ 87

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- Definition The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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