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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Interest Rate Caps Sold |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | $ 8,000 | $ 7,400
Purchase [Member] |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | 3,000 | 2,300
Interest Rate Cap [Member] |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | 10,968 | 9,736
Interest Rate Cap [Member] | Subsidiary Issuers |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | 5,000 | 5,100
Interest Rate Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | 1,000 | 1,950
Currency Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] |  |
Derivative, Notional Amount | $ 934 | $ 692

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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