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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 18, 2020 | Jul. 29, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jul. 29, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 35,908 |  | $ 35,908 |  |  |  | $ 36,038
Tax expense |  |  | 124 | $ 53 | 176 | $ 144 |  |  |
Net adjustment to noncontrolling interests from dissolution |  |  | 762 |  | 762 |  |  |  |
Tax expense |  |  |  |  | 112 |  |  |  |
Investment |  |  | 2,772 |  | 2,772 |  |  |  | $ 2,720
Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net adjustment to noncontrolling interests from dissolution |  |  | 36 |  | 36 |  |  |  |
Banc of America Merchant Services | Corporate joint venture |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest in joint venture |  |  |  |  |  |  |  | 51.00% |
Banc of America Merchant Services Joint Venture |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest, period increase (decrease) |  |  | $ 726 |  |  |  |  |  |
Banc of America Merchant Services Joint Venture | Bank Of America |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Processing and other support services agreement, term (in years) |  |  | 5 years |  |  |  |  |  |
Banc of America Merchant Services Joint Venture | Corporate joint venture | Bank Of America |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain |  |  | $ 36 |  |  |  |  |  |
Tax expense |  |  | 13 |  |  |  |  |  |
Revaluation/Remeasurement gain |  |  | 700 |  |  |  |  |  |
Additional consideration gain |  |  | 24 |  |  |  |  |  |
Investment Services Business |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) | 60.00% |  |  |  |  |  |  |  |
Percentage of interest owned in affiliate | 40.00% |  |  |  |  |  |  |  |
Investment |  |  | 178 |  | 178 |  |  |  |
Disposal Group, Disposed of by Sale |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revaluation/Remeasurement gain | $ 176 |  |  |  |  |  |  |  |
Consideration from sale of business | 578 |  |  |  |  |  |  |  |
Tax expense | $ 112 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale | Investment Services Business |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) | 60.00% |  |  |  |  |  |  |  |
Pre-tax gain on sale | $ 428 |  |  |  |  |  |  |  |
First Data |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of business acquired |  | 100.00% |  |  |  |  |  |  |
Entity shares issued per acquiree share (in shares) |  | 0.303 |  |  |  |  |  |  |
Repayment of First Data debt |  | $ 16,414 |  |  |  |  |  |  |
Increase in goodwill |  |  |  |  |  |  | $ 304 |  |
Measurement period adjustments, reduction in intangible assets |  |  |  |  |  |  | 155 |  |
Measurement period adjustments, reduction in noncontrolling interests |  |  |  |  |  |  | 126 |  |
Measurement period adjustments, reduction in property and equipment |  |  |  |  |  |  | 25 |  |
Measurement period adjustments, increase in accounts payable and accrued expenses |  |  |  |  |  |  | 37 |  |
Measurement period adjustments, reduction in investments in unconsolidated affiliates |  |  |  |  |  |  | 23 |  |
Measurement period adjustments, increase in other long-term liabilities |  |  |  |  |  |  | 21 |  |
Measurement period adjustments, increase in deferred tax liabilities |  |  |  |  |  |  | $ 178 |  |
Transaction expenses incurred |  |  |  | 47 |  | 172 |  |  |
Payments for acquisitions of businesses |  | 46,475 |  |  |  |  |  |  |
Goodwill |  | $ 30,811 |  |  |  |  |  |  |
First Data | Common Shares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued to acquire First Data (in shares) |  | 286,000,000 |  |  |  |  |  |  |
First Data | Equity Awards |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued to acquire First Data (in shares) |  | 15,000,000 |  |  |  |  |  |  |
First Data | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Transaction expenses incurred |  |  |  | 45 |  | 74 |  |  |
First Data | Debt Financing Activities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Transaction expenses incurred |  |  |  | $ 2 |  | $ 98 |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  | 35 |  | 35 |  |  |  |
Payments for acquisitions of businesses |  |  |  |  | 167 |  |  |  |
Acquired cash |  |  |  |  | 2 |  |  |  |
Earn-out provisions estimated value |  |  | 45 |  | 45 |  |  |  |
Goodwill |  |  | 82 |  | 82 |  |  |  |
Net assumed liabilities |  |  | 6 |  | 6 |  |  |  |
Other Acquisitions | Software And Customer Intangible Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 56 |  | 56 |  |  |  |
Other Acquisitions | Residual Buyout Intangible Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 35 |  | $ 35 |  |  |  |

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