Business Segments and Related Information - Schedule of Segment Assets Reconciliation to our Consolidated Total Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Current assets	$ 13,237	$ 15,133
Other assets	954	997
Total assets	77,822	77,168
Operating Segments
Segment Reporting Information [Line Items]
Total assets	59,050	56,900
Corporate Nonsegment
Segment Reporting Information [Line Items]
Construction in progress	4,581	4,138
Current assets	13,237	15,133
Other assets	954	997
NGL Pipelines & Services | Operating Segments
Segment Reporting Information [Line Items]
Total assets	23,394	21,900
Crude Oil Pipelines & Services | Operating Segments
Segment Reporting Information [Line Items]
Total assets	11,168	11,390
Natural Gas Pipelines & Services | Operating Segments
Segment Reporting Information [Line Items]
Total assets	13,036	12,260
Petrochemical & Refined Products Services | Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 11,452	$ 11,350