Fair value of securities received as collateral against derivative assets.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Fair Value Measurements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Derivatives, Fair Value [Line Items]
Carrying amount of our investments without readily determinable fair values	$ 266,000,000			$ 284,000,000
Investments without readily determinable fair values, impairment loss	0
Derivative asset fair value of collateral	(100,000,000)
Derivative liability fair value of collateral	1,300,000,000
Interest rate swaps
Derivatives, Fair Value [Line Items]
Net investment hedge	17,909,000,000			17,004,000,000
Interest rate swaps \| Fair Value Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period	2,400,000,000	$ 510,000,000
Notional amount of derivative settled during period	1,500,000,000	1,200,000,000
Ineffectiveness portion of interest rate swaps	60,000,000
Cross currency swaps
Derivatives, Fair Value [Line Items]
Net investment hedge	23,070,000,000			23,070,000,000
Cross currency swaps \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Pre-tax gains (loss) recognized in other comprehensive income (loss)	(3,000,000,000.0)
Forward starting interest rate swaps
Derivatives, Fair Value [Line Items]
Net investment hedge	2,000,000,000			3,000,000,000
Forward starting interest rate swaps \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period		0
Notional amount of derivative settled during period	1,000,000,000.0	1,000,000,000.0
Pre-tax gains (loss) recognized in other comprehensive income (loss)	(840,000,000)	(203,000,000)
Treasury Lock
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period	1,600,000,000	0
Treasury Lock \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period	500,000,000	0
Euro Denominated Debt \| Net Investment Hedges
Derivatives, Fair Value [Line Items]
Net investment hedge \| €			€ 750,000,000		€ 750,000,000
Foreign exchange forwards
Derivatives, Fair Value [Line Items]
Notional amount of derivative instruments entered during period	2,700,000,000	3,000,000,000.0
Notional amount of derivative settled during period	2,800,000,000	$ 2,600,000,000
Net investment hedge	$ 955,000,000			$ 1,130,000,000