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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, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale investments: |  |
Available-for-sale investments | $ 4 | $ 5
Derivative assets | 1,109 | 728
Derivative liabilities | (1,611) | (1,515)
Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1,098 | 726
Derivative liabilities | (345) | (160)
Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 10 | 2
Derivative liabilities | (852) | (988)
Other [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1 |
Derivative liabilities | (8) | (2)
Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (406) | (365)
Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 4 | 5
Derivative assets | 1,109 | 728
Total | 1,113 | 733
Derivative liabilities | (1,611) | (1,515)
Total | (1,611) | (1,515)
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1,098 | 726
Derivative liabilities | (345) | (160)
Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 10 | 2
Derivative liabilities | (852) | (988)
Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1 |
Derivative liabilities | (8) | (2)
Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (406) | (365)
Fair Value Measurements Recurring [Member] | Agency Residential Mortgage-Backed Securities [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 1 | 1
Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 3 | 4
Level 2 [Member] | Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 4 | 5
Derivative assets | 1,070 | 709
Total | 1,074 | 714
Derivative liabilities | (727) | (547)
Total | (727) | (547)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1,070 | 709
Derivative liabilities | (280) | (99)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (41) | (83)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (406) | (365)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Agency Residential Mortgage-Backed Securities [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 1 | 1
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 3 | 4
Level 3 [Member] | Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 39 | 19
Total | 39 | 19
Derivative liabilities | (884) | (968)
Total | (884) | (968)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 28 | 17
Derivative liabilities | (65) | (61)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 10 | 2
Derivative liabilities | (811) | (905)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 1 |
Derivative liabilities | $ (8) | $ (2)

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