Employee Benefits - Schedule of Funded Status of the Plans Reconciled to the Amount Reported in the Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Postretirement benefit plans
Change in plan assets:
Funded status, end of year	$ (106)	$ (117)
U.S. Plans | Pension
Change in projected benefit obligation:
Benefit obligation, beginning of year	2,962	3,301
Service cost	4	4	$ 5
Interest cost	149	154	168
Actuarial gain (loss)	40	(200)
AIG assets	(16)	(17)
Plan assets	(247)	(280)
Plan amendment	0	0
Settlements	0	0
Foreign exchange effect	0	0
Other	(1)	0
Projected benefit obligation, end of year	2,891	2,962	3,301
Change in plan assets:
Fair value of plan assets, beginning of year	2,976	3,228
Actual return on plan assets, net of expenses	236	28
AIG contributions	16	17
AIG assets	(16)	(17)
Plan assets	(247)	(280)
Settlements	0	0
Foreign exchange effect	0	0
Fair value of plan assets, end of year	2,965	2,976	3,228
Funded status, end of year	74	14
Amounts recognized in the balance sheet:
Assets	242	184
Liabilities	(168)	(170)
Total amounts recognized	74	14
Pre-tax amounts recognized in AOCI:
Net gain (loss)	(1,025)	(1,082)
Prior service (cost) credit	0	0
Total amounts recognized	(1,025)	(1,082)
U.S. Plans | Pension | Defined Benefit Plan, Unfunded Plan
Change in projected benefit obligation:
Benefit obligation, beginning of year	170
Projected benefit obligation, end of year	168	170
Foreign Plan | Pension
Change in projected benefit obligation:
Benefit obligation, beginning of year	747	804
Service cost	14	14	16
Interest cost	20	20	20
Actuarial gain (loss)	(34)	14
AIG assets	(8)	(9)
Plan assets	(32)	(28)
Plan amendment	1	1
Settlements	(7)	(9)
Foreign exchange effect	34	(60)
Other	1	0
Projected benefit obligation, end of year	736	747	804
Change in plan assets:
Fair value of plan assets, beginning of year	704	734
Actual return on plan assets, net of expenses	16	35
AIG contributions	38	42
AIG assets	(8)	(9)
Plan assets	(32)	(28)
Settlements	(7)	(9)
Foreign exchange effect	24	(61)
Fair value of plan assets, end of year	735	704	$ 734
Funded status, end of year	(1)	(43)
Amounts recognized in the balance sheet:
Assets	157	122
Liabilities	(158)	(165)
Total amounts recognized	(1)	(43)
Pre-tax amounts recognized in AOCI:
Net gain (loss)	(50)	(72)
Prior service (cost) credit	(16)	(18)
Total amounts recognized	(66)	(90)
Foreign Plan | Pension | Defined Benefit Plan, Unfunded Plan
Change in projected benefit obligation:
Benefit obligation, beginning of year	139
Projected benefit obligation, end of year	$ 138	$ 139