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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Mar. 31, 2026 USD ($)
Senior Notes
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	$ 0
Contractual Obligations, Payments Due by Period, 2027	750
Contractual Obligations, Payments Due by Period, 2028	0
Contractual Obligations, Payments Due by Period, 2029	750
Contractual Obligations, Payments Due by Period, 2030	0
Contractual Obligations, Payments Due by Period, Thereafter	8,050
Contractual Obligations, Payments Due by Period, Total	9,550
Note Purchase Agreements
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	325
Contractual Obligations, Payments Due by Period, 2027	478
Contractual Obligations, Payments Due by Period, 2028	200
Contractual Obligations, Payments Due by Period, 2029	350
Contractual Obligations, Payments Due by Period, 2030	466
Contractual Obligations, Payments Due by Period, Thereafter	1,189
Contractual Obligations, Payments Due by Period, Total	3,008
Credit Agreement
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	285
Contractual Obligations, Payments Due by Period, 2027	0
Contractual Obligations, Payments Due by Period, 2028	0
Contractual Obligations, Payments Due by Period, 2029	0
Contractual Obligations, Payments Due by Period, 2030	0
Contractual Obligations, Payments Due by Period, Thereafter	0
Contractual Obligations, Payments Due by Period, Total	285
Premium Financing Debt Facility
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	156
Contractual Obligations, Payments Due by Period, 2027	0
Contractual Obligations, Payments Due by Period, 2028	0
Contractual Obligations, Payments Due by Period, 2029	0
Contractual Obligations, Payments Due by Period, 2030	0
Contractual Obligations, Payments Due by Period, Thereafter	0
Contractual Obligations, Payments Due by Period, Total	156
Interest on debt
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	386
Contractual Obligations, Payments Due by Period, 2027	593
Contractual Obligations, Payments Due by Period, 2028	539
Contractual Obligations, Payments Due by Period, 2029	528
Contractual Obligations, Payments Due by Period, 2030	473
Contractual Obligations, Payments Due by Period, Thereafter	6,117
Contractual Obligations, Payments Due by Period, Total	8,636
Total debt obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	1,152
Contractual Obligations, Payments Due by Period, 2027	1,821
Contractual Obligations, Payments Due by Period, 2028	739
Contractual Obligations, Payments Due by Period, 2029	1,628
Contractual Obligations, Payments Due by Period, 2030	939
Contractual Obligations, Payments Due by Period, Thereafter	15,356
Contractual Obligations, Payments Due by Period, Total	21,635
Operating lease obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	120
Contractual Obligations, Payments Due by Period, 2027	148
Contractual Obligations, Payments Due by Period, 2028	113
Contractual Obligations, Payments Due by Period, 2029	88
Contractual Obligations, Payments Due by Period, 2030	77
Contractual Obligations, Payments Due by Period, Thereafter	191
Contractual Obligations, Payments Due by Period, Total	737
Less sublease arrangements
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, Thereafter	0
Contractual Obligations, Sublease Arrangement, 2026	(3)
Contractual Obligations, Sublease Arrangement, 2027	(2)
Contractual Obligations, Sublease Arrangement, 2028	(2)
Contractual Obligations, Sublease Arrangement, 2029	(1)
Contractual Obligations, Sublease Arrangement, 2030	0
Contractual Obligations, Sublease Arrangement, Total	(8)
Outstanding purchase obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	233
Contractual Obligations, Payments Due by Period, 2027	246
Contractual Obligations, Payments Due by Period, 2028	94
Contractual Obligations, Payments Due by Period, 2029	66
Contractual Obligations, Payments Due by Period, 2030	34
Contractual Obligations, Payments Due by Period, Thereafter	65
Contractual Obligations, Payments Due by Period, Total	738
Total contractual obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2026	1,502
Contractual Obligations, Payments Due by Period, 2027	2,213
Contractual Obligations, Payments Due by Period, 2028	944
Contractual Obligations, Payments Due by Period, 2029	1,781
Contractual Obligations, Payments Due by Period, 2030	1,050
Contractual Obligations, Payments Due by Period, Thereafter	15,612
Contractual Obligations, Payments Due by Period, Total	$ 23,102

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Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]

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Recorded unconditional purchase obligation receivable.

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Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of recorded unconditional purchase obligation maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of recorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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Amount of recorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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