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Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | $ 276 | $ 357
Derivative liabilities | (269) | (533)
Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 263 | 329
Derivative liabilities | (9) | (14)
Cross-Currency Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 13 | 28
Derivative liabilities | (121) | (322)
Floor Income Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | (139) | (197)
Fair Value Measurements Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 276 | 357
Total | 276 | 357
Derivative liabilities | (269) | (533)
Total | (269) | (533)
Fair Value Measurements Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 260 | 323
Total | 260 | 323
Derivative liabilities | (139) | (197)
Total | (139) | (197)
Fair Value Measurements Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 16 | 34
Total | 16 | 34
Derivative liabilities | (130) | (336)
Total | (130) | (336)
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 263 | 329
Derivative liabilities | (9) | (14)
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 260 | 323
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 3 | 6
Derivative liabilities | (9) | (14)
Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 13 | 28
Derivative liabilities | (121) | (322)
Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 13 | 28
Derivative liabilities | (121) | (322)
Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | (139) | (197)
Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | $ (139) | $ (197)

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