Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail) - Fair Value Hedging - Interest Expense - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Amount of Gain (Loss) Recognized in Income	$ (13)	$ (18)	$ (86)	$ (41)
Fixed-Rate Debt
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Items Amount of Gain (Loss) Recognized in Income	$ 13	$ 18	$ 86	$ 41

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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