Summary of Significant Accounting Policies Derivatives Pretax Amounts Affecting Income and Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (12)	$ 31
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	164	(25)
Gain (loss) reclassified into income from AOCI	0	21
Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	1,005	(395)
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	45	26
Gain (loss) reclassified into income from AOCI
Interest rate \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	38	15
Gain (loss) reclassified into income from AOCI	1	1
Total Other Currencies \| Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	891	(435)
Gain (loss) reclassified into income from AOCI
Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(3)	4
Foreign currency \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	126	(40)
Gain (loss) reclassified into income from AOCI	(1)	20
Foreign currency derivatives \| Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	114	40
Cross Currency Interest Rate Contract [Member] \| Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	45	26
Equity
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (9)	$ 27

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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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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