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Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale investments: |  |
Available-for-sale investments | $ 3 | $ 3
Derivative assets | 471 | 565
Derivative liabilities | (1,540) | (1,701)
Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 471 | 565
Derivative liabilities | (194) | (208)
Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (1,166) | (1,296)
Other [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (16) | (13)
Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (164) | (184)
Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 3 | 3
Derivative assets | 471 | 565
Total | 474 | 568
Derivative liabilities | (1,540) | (1,701)
Total | (1,540) | (1,701)
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 471 | 565
Derivative liabilities | (194) | (208)
Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (1,166) | (1,296)
Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (16) | (13)
Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (164) | (184)
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 | 2 | 2
Level 2 [Member] | Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Available-for-sale investments | 3 | 3
Derivative assets | 467 | 553
Total | 470 | 556
Derivative liabilities | (353) | (387)
Total | (353) | (387)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 467 | 553
Derivative liabilities | (148) | (150)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (41) | (53)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (164) | (184)
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 | 2 | 2
Level 3 [Member] | Fair Value Measurements Recurring [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 4 | 12
Total | 4 | 12
Derivative liabilities | (1,187) | (1,314)
Total | (1,187) | (1,314)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative assets | 4 | 12
Derivative liabilities | (46) | (58)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | (1,125) | (1,243)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Other [Member] |  |
Available-for-sale investments: |  |
Derivative liabilities | $ (16) | $ (13)

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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