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Short-Term and Long-Term Debt - Schedule of Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 300,000,000	$ 250,000,000
Total short-term debt	300,000,000	250,000,000
Term loan and subordinated notes	995,000,000	995,000,000
Total long-term debt	$ 5,856,000,000	5,699,000,000
Debt repurchase option	100.00%
Repayments of debt	$ 100,000,000	500,000,000	$ 300,000,000
Fixed interest rate	5.00%
Senior notes
Debt Instrument [Line Items]
Senior notes	$ 4,418,000,000	4,368,000,000
Term loan
Debt Instrument [Line Items]
Term loan and subordinated notes	150,000,000	0
Capital securities
Debt Instrument [Line Items]
Capital securities	218,000,000	218,000,000
Long-term debt
Debt Instrument [Line Items]
Unamortized premiums (discounts)	(6,000,000)	(6,000,000)
Unamortized debt issuance costs	(30,000,000)	(30,000,000)
Unamortized adjustments from discontinued hedges	310,000,000	326,000,000
Fair value hedge on interest rate swap agreements	(199,000,000)	(172,000,000)
Total long-term debt	5,856,000,000	5,699,000,000
3.35% notes, due 2025 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 0	300,000,000
Debt instrument, interest rate, stated percentage	3.35%
3.625% notes, due 2026 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 400,000,000	400,000,000
Debt instrument, interest rate, stated percentage	3.625%
3.80% notes, due 2028 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage	3.80%
3.05% notes, due 2030 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage	3.05%
3.40% notes, due 2031 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage	3.40%
3.40% notes, due 2032 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 300,000,000	300,000,000
Debt instrument, interest rate, stated percentage	3.40%
5.852% notes, due 2034 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 350,000,000	0
Debt instrument, interest rate, stated percentage	5.852%
6.15% notes, due 2036 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 243,000,000	243,000,000
Debt instrument, interest rate, stated percentage	6.15%
6.30% notes, due 2037 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 375,000,000	375,000,000
Debt instrument, interest rate, stated percentage	6.30%
7.00% notes, due 2040 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage	7.00%
4.35% notes, due 2048 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 450,000,000	450,000,000
Debt instrument, interest rate, stated percentage	4.35%
4.375% notes, due 2050 \| Senior notes
Debt Instrument [Line Items]
Senior notes	$ 300,000,000	300,000,000
Debt instrument, interest rate, stated percentage	4.375%
Term loan due 2027 \| Term loan
Debt Instrument [Line Items]
Term loan and subordinated notes	$ 150,000,000	0
Term loan due 2027 \| Term loan \| Variable Rate Component One
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.10%
SOFR + 236 bps, due 2066 \| Subordinated notes
Debt Instrument [Line Items]
Term loan and subordinated notes	$ 562,000,000	562,000,000
SOFR + 236 bps, due 2066 \| Subordinated notes \| Variable Rate Component One
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.36%
SOFR + 236 bps, due 2066 \| Capital securities
Debt Instrument [Line Items]
Capital securities	$ 160,000,000	160,000,000
SOFR + 236 bps, due 2066 \| Capital securities \| Variable Rate Component One
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.26161%
SOFR + 236 bps, due 2066 \| Capital securities \| Variable Rate Component Two
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.36%
SOFR + 204 bps, due 2067 \| Subordinated notes
Debt Instrument [Line Items]
Term loan and subordinated notes	$ 433,000,000	433,000,000
SOFR + 204 bps, due 2067 \| Subordinated notes \| Variable Rate Component Two
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.04%
SOFR + 204 bps, due 2067 \| Capital securities
Debt Instrument [Line Items]
Capital securities	$ 58,000,000	$ 58,000,000
SOFR + 204 bps, due 2067 \| Capital securities \| Variable Rate Component One
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.26161%
SOFR + 204 bps, due 2067 \| Capital securities \| Variable Rate Component Two
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.04%
Term Loan Due July 16, 2027 \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.375%	1.125%
Repayments of debt	$ 100,000,000
Debt instrument, face amount	$ 150,000,000