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Fair Value Measurements - Change in Fair Values of Level 3 Financial Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Other Investments [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | $ 7 | $ 3
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 4 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers Other | 0 | 0
Transfers into Level 3 | 1 | 4
Transfers out of Level 3 | 0 | 0
End of Period Balance | 12 | 7
Unrealized Gains (Losses) Included in Earnings | 4 | 0
Other Investments [Member] | Principal Direct Investments [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 1 | 13
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 0 | (1)
Purchases | 0 | 5
Sales | 0 | (16)
Settlements | 0 | 0
Transfers Other | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
End of Period Balance | 1 | 1
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Available-for-sale Securities [Member] | Other Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 20 | 20
Gains (Losses) included in comprehensive income | 15 | 0
Gains (Losses) Included in Earnings | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers Other | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (24) | 0
End of Period Balance | 11 | 20
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Interest Rate [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 5 | 9
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 3 | (2)
Purchases | 2 | 1
Sales | (1) | (2)
Settlements | 0 | 0
Transfers Other | 0 | 0
Transfers into Level 3 | 21 | 7
Transfers out of Level 3 | (8) | (8)
End of Period Balance | 22 | 5
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Credit [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 0 | 1
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | (8) | (31)
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 30
Transfers Other | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
End of Period Balance | (8) | 0
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Other [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 3 | 3
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers Other | 2 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
End of Period Balance | 5 | 3
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Loans Held For Sale Fair Value [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 0 | 1
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 0 | 0
Purchases | 0 | 0
Sales | (1) | (1)
Settlements | 0 | 0
Transfers Other | 1 | (1)
Transfers into Level 3 | 0 | 1
Transfers out of Level 3 | 0 | 0
End of Period Balance | 0 | 0
Unrealized Gains (Losses) Included in Earnings | 0 | 0
Loans Held For Investment Fair Value [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning of Period Balance | 3 | 2
Gains (Losses) included in comprehensive income | 0 | 0
Gains (Losses) Included in Earnings | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers Other | 1 | 1
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
End of Period Balance | 4 | 3
Unrealized Gains (Losses) Included in Earnings | $ 0 | $ 0

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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