Benefit Plans - Schedule of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Free-standing derivatives, liabilities | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value		$ (1)
Free-standing derivatives, liabilities | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value		(8)
Free-standing derivatives, liabilities | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value		0
Pension benefits
Components of net periodic cost
Total plan assets at fair value	$ 2,915	$ 2,574
Total plan assets at fair value, allocation (as a percent)	100.00%	100.00%
Investments measured using the net asset value practical expedient	$ 1,570	$ 2,019
Securities lending obligation	(158)	(179)
Derivatives counterparty and cash collateral netting	(8)	8
Other net plan assets	49	18
Total reported plan assets	4,368	4,440	$ 4,430
Pension benefits | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	$ 1,582	$ 609
Total plan assets at fair value, allocation (as a percent)	54.20%	23.70%
Pension benefits | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	$ 1,252	$ 1,965
Total plan assets at fair value, allocation (as a percent)	43.00%	76.30%
Pension benefits | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	$ 81	$ 0
Total plan assets at fair value, allocation (as a percent)	2.80%	0.00%
Total reported plan assets	$ 81	$ 0
Pension benefits | Equity securities
Components of net periodic cost
Total plan assets at fair value	107	160
Pension benefits | Equity securities | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	106	132
Pension benefits | Equity securities | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	1	28
Pension benefits | Equity securities | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Government bonds
Components of net periodic cost
Total plan assets at fair value	1,525	1,330
Pension benefits | Government bonds | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	1,401	323
Pension benefits | Government bonds | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	124	1,007
Pension benefits | Government bonds | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Corporate bonds
Components of net periodic cost
Total plan assets at fair value	985	794
Pension benefits | Corporate bonds | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Corporate bonds | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	985	794
Pension benefits | Corporate bonds | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Short-term investments
Components of net periodic cost
Total plan assets at fair value	220	298
Pension benefits | Short-term investments | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	78	154
Pension benefits | Short-term investments | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	142	144
Pension benefits | Short-term investments | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Free-standing derivatives, assets
Components of net periodic cost
Total plan assets at fair value	9	0
Pension benefits | Free-standing derivatives, assets | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Free-standing derivatives, assets | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	9	0
Pension benefits | Free-standing derivatives, assets | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0	0
Pension benefits | Free-standing derivatives, liabilities
Components of net periodic cost
Total plan assets at fair value	(12)	(9)
Pension benefits | Free-standing derivatives, liabilities | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	(3)
Pension benefits | Free-standing derivatives, liabilities | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	(9)
Pension benefits | Free-standing derivatives, liabilities | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	0
Pension benefits | Bank loans
Components of net periodic cost
Total plan assets at fair value	81
Pension benefits | Bank loans | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value	0
Pension benefits | Bank loans | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value	0
Pension benefits | Bank loans | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value	81
Total reported plan assets	$ 81	0
Pension benefits | Free-standing derivatives, other assets
Components of net periodic cost
Total plan assets at fair value		1
Pension benefits | Free-standing derivatives, other assets | Quoted prices in active markets for identical assets (Level 1)
Components of net periodic cost
Total plan assets at fair value		1
Pension benefits | Free-standing derivatives, other assets | Significant other observable inputs (Level 2)
Components of net periodic cost
Total plan assets at fair value		0
Pension benefits | Free-standing derivatives, other assets | Significant unobservable inputs (Level 3)
Components of net periodic cost
Total plan assets at fair value		$ 0