Debt - Debt Cash Tender Offers and Redemptions (Details) € in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 EUR (€)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (14)	$ 37	$ (303)
Certain Notes And Debentures Issued Or Guaranteed
Debt Instrument [Line Items]
Repayments of long-term debt	2,000
Debt redeemed, including accrued and unpaid interest	2,100
Gain (loss) on extinguishment of debt	(14)
Notes Due February 15, 2024 | Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt	$ 459
Interest rate (as a percent)	4.125%			4.125%
Series A-3 Junior Subordinated Debentures | Junior subordinated debt
Debt Instrument [Line Items]
Debt redeemed	$ 46			€ 41,550
Zero Coupon Callable Notes Due 2047 | Senior Notes
Debt Instrument [Line Items]
Debt redeemed, including accrued and unpaid interest	$ 543
Interest rate (as a percent)	0.00%			0.00%
Debt redeemed	$ 400
Certain Notes And Debentures Issued Or Guaranteed, Tender Offer
Debt Instrument [Line Items]
Repayments of long-term debt	1,130
Debt redeemed, including accrued and unpaid interest	$ 1,140