Contractual Obligations and Commitments - Commercial Paper (Details) - Commercial Paper - USD ($)	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Commercial paper outstanding (at par)	$ 197,000,000		$ 191,000,000
Maximum borrowing capacity	2,750,000,000		2,750,000,000
Borrowing capacity available	$ 2,553,000,000		$ 2,559,000,000
Weighted average maturity	19 days	20 days
Weighted average yield	4.59%	4.70%