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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Gain (Loss) on Derivatives, Net | $ (3) | $ (129)
Unrealized Gain (Loss) on Derivatives | 88 | 716
Total Gain (Loss) On Derivatives, Net | (16) | 1
Realized Gain (Loss) on Derivatives | 6 | (74)
Unrealized Gain (Loss) on Hedged Item | (101) | (586)
Total Gain (Loss) on Derivatives, Gross | (7) | 56
Trading [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | 54 | 98
Realized Gain (Loss) on Derivatives | (3) | (129)
Unrealized Gain (Loss) on Derivatives, Net | 88 | 716
Total Gain (Loss) on Derivatives, Gross | 51 | (31)
Trading [Member] | Interest Rate Swaps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | (7) | 53
Realized Gain (Loss) on Derivatives | 20 | 10
Total Gain (Loss) on Derivatives, Gross | 13 | 63
Trading [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | 12 | 20
Realized Gain (Loss) on Derivatives | (1) | (1)
Total Gain (Loss) on Derivatives, Gross | 11 | 19
Trading [Member] | Floor Income Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | 53 | 27
Realized Gain (Loss) on Derivatives | (20) | (138)
Total Gain (Loss) on Derivatives, Gross | 33 | (111)
Trading [Member] | Other [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | (4) | (2)
Realized Gain (Loss) on Derivatives | (2) |
Total Gain (Loss) on Derivatives, Gross | (6) | (2)
Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | (101) | (586)
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | 34 | 618
Realized Gain (Loss) on Derivatives | 25 | 55
Unrealized Gain (Loss) on Hedged Item | (101) | (586)
Total Gain (Loss) on Derivatives, Gross | (42) | 87
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | (84) | 244
Realized Gain (Loss) on Derivatives | 54 | 71
Unrealized Gain (Loss) on Hedged Item | 61 | (280)
Total Gain (Loss) on Derivatives, Gross | 31 | 35
Designated as Hedging Instrument [Member] | Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | 118 | 374
Realized Gain (Loss) on Derivatives | (29) | (16)
Unrealized Gain (Loss) on Hedged Item | (162) | (306)
Total Gain (Loss) on Derivatives, Gross | (73) | 52
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Gain (Loss) on Derivatives | (16) |
Total Gain (Loss) on Derivatives, Gross | (16) |
Designated as Hedging Instrument [Member] | Cash Flow [Member] | Interest Rate Swaps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Gain (Loss) on Derivatives | (16) |
Total Gain (Loss) on Derivatives, Gross | (16) |
Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Less: realized gains (losses) recorded in interest expense | 9 | 55
Realized Gain (Loss) on Derivatives | $ 9 | $ 55

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- Definition Realized gain (loss) on derivatives, net of realized gains (losses) recorded in interest expense. + References No definition available. + Details
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- Definition Total gain (loss) on derivatives, including realized gains (losses) recorded in interest expense. + References No definition available. + Details
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- Definition Unrealized gain (loss) on derivatives, net of realized gains (losses) recorded in interest expense. + References No definition available. + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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