Basis of Presentation and Summary of Significant Accounting Policies - Impairment and Goodwill by Reporting Unit and Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Goodwill [Line Items]
Goodwill impairment	$ 6,452	$ 0	$ 6,452	$ 0
Goodwill	30,953		30,953		$ 37,703
Reporting Units Impacted By Impairment
Goodwill [Line Items]
Goodwill impairment			6,452
Goodwill	13,065		13,065
Merchant Segment
Goodwill [Line Items]
Goodwill impairment			3,692
Goodwill	19,315		19,315		23,106
Merchant Segment \| Reporting Unit 1
Goodwill [Line Items]
Goodwill impairment			373
Goodwill	945		945
Merchant Segment \| Reporting Unit 5
Goodwill [Line Items]
Goodwill impairment			863
Goodwill	1,694		1,694
Merchant Segment \| Reporting Unit 6
Goodwill [Line Items]
Goodwill impairment			831
Goodwill	3,454		3,454
Merchant Segment \| Reporting Unit 7
Goodwill [Line Items]
Goodwill impairment			916
Goodwill	647		647
Merchant Segment \| Reporting Unit 8
Goodwill [Line Items]
Goodwill impairment			709
Goodwill	3,870		3,870
Financial Segment
Goodwill [Line Items]
Goodwill impairment			2,760
Goodwill	11,638		11,638		$ 14,597
Financial Segment \| Reporting Unit 2
Goodwill [Line Items]
Goodwill impairment			1,686
Goodwill	302		302
Financial Segment \| Reporting Unit 4
Goodwill [Line Items]
Goodwill impairment			281
Goodwill	0		0
Financial Segment \| Reporting Unit 9
Goodwill [Line Items]
Goodwill impairment			679
Goodwill	1,840		1,840
Financial Segment \| Reporting Unit 10
Goodwill [Line Items]
Goodwill impairment			114
Goodwill	$ 313		$ 313