Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Fair value of securities pledged as collateral against derivative liabilities.

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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.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes.

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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Jul. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other investment not readily marketable, fair value	$ 300,000,000
Collateral related to derivative contracts	100,000,000				$ 0
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative notional amount	19,835,000,000				20,173,000,000
Interest rate swaps \| Fair Value Hedges
Derivatives, Fair Value [Line Items]
Derivative notional amount	700,000,000
Settled interest rate swaps \| Fair Value Hedges
Derivatives, Fair Value [Line Items]
Derivative notional amount	1,100,000,000
Cross currency swaps
Derivatives, Fair Value [Line Items]
Derivative notional amount	16,638,000,000				16,638,000,000
Cross currency swaps \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Pre-tax gains (loss) recognized in other comprehensive income (loss)	1,100,000,000	$ 400,000,000	$ 500,000,000
Euro Denominated Debt \| Net Investment Hedges
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 800,000,000				$ 900,000,000
Subsequent Event \| Forward interest rate swaps \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative notional amount				$ 3,000,000,000