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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ 5 |  |
Interest Rate Swap [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | $ 900 | $ 0
Interest Rate Caps [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | 10,179 | 0
Interest Rate Caps [Member] | Interest Rate Caps Sold |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | 8,200 | 6,200
Interest Rate Caps [Member] | Interest Rate Caps Purchased |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | 2,000 | 2,100
Interest Rate Caps [Member] | Interest Rate Caps Purchased | Subsidiary Issuers |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | 6,200 | 4,200
Currency Swap [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative, Notional Amount |  | $ 811 | $ 0

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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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