Derivative Financial Instruments - Impact of Derivatives on Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivative Assets:
Derivative assets	$ 0	$ 42
Derivative Liabilities:
Derivative liabilities	(101)	(79)
Net total derivatives	(101)	(37)
Designated as Hedging Instrument [Member] \| Cash Flow [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	0	0
Net total derivatives	0	0
Designated as Hedging Instrument [Member] \| Fair Value [Member]
Derivative Assets:
Derivative assets	0	42
Derivative Liabilities:
Derivative liabilities	(101)	(79)
Net total derivatives	(101)	(37)
Trading [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	0	0
Net total derivatives	0	0
Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	0	39
Derivative Liabilities:
Derivative liabilities	(6)	0
Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	0	0
Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Fair Value [Member]
Derivative Assets:
Derivative assets	0	39
Derivative Liabilities:
Derivative liabilities	(6)	0
Interest Rate Swaps [Member] \| Trading [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	0	0
Cross-Currency Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	0	3
Derivative Liabilities:
Derivative liabilities	(95)	(79)
Cross-Currency Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	0	0
Cross-Currency Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Fair Value [Member]
Derivative Assets:
Derivative assets	0	3
Derivative Liabilities:
Derivative liabilities	(95)	(79)
Cross-Currency Interest Rate Swaps [Member] \| Trading [Member]
Derivative Assets:
Derivative assets	0	0
Derivative Liabilities:
Derivative liabilities	$ 0	$ 0