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)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value of securities pledged as collateral against derivative liabilities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
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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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-Section 50
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Debt Tender Offer, Number Of Debt Instruments

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Fair Value Measurements and Financial Instruments - Narrative (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Debt_Instrument	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Derivatives, Fair Value [Line Items]
Carrying amount of investments without readily determinable fair values		$ 200
Number of debt instruments in tender offers \| Debt_Instrument	8
Derivative liability fair value of collateral		100
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative notional mount		19,813	$ 20,173
Interest rate swaps \| Fair Value Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period		700	7,500
Notional amount of derivative settled		1,100	500
Cross currency swaps
Derivatives, Fair Value [Line Items]
Derivative notional mount		16,638	16,638
Cross currency swaps \| Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period			14,000
Notional amount of derivative settled			10,200
Pre-tax gain (loss) recognized in other comprehensive income (loss)		(700)	1,400
Forward starting interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative notional mount		4,000	0
Forward starting interest rate swaps \| Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period		4,000
Pre-tax gain (loss) recognized in other comprehensive income (loss)		(100)
Euro-denominated debt \| Net Investment Hedging
Derivatives, Fair Value [Line Items]
Derivative notional mount		800	900
New interest rate caps
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period			300
Foreign exchange forwards
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period		2,800
Notional amount of derivative settled		2,200
Derivative notional mount		$ 600	$ 0
Treasury rate locks
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period	$ 2,000