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Acquisitions and Dispositions - Narrative (Details) £ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 18, 2020 USD ($) | Dec. 04, 2019 | Jul. 29, 2019 USD ($) shares | Oct. 31, 2018 USD ($) | May 11, 2017 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) acquisition | Jan. 10, 2018 USD ($) | Jan. 10, 2018 GBP (£)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible asset amortization |  |  |  |  |  |  |  |  |  | $ 1,299,000,000 | $ 347,000,000 | $ 326,000,000 |  |
Goodwill |  |  |  |  |  | $ 36,038,000,000 |  | $ 36,038,000,000 |  | 36,038,000,000 | 5,702,000,000 | 5,590,000,000 |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of business |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  |  | 17,000,000 |  |  |  |  |  |  |  | $ 50,000,000 | £ 37
Tax expense from sale of business |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquired |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Entity shares issued per acquiree share (in shares) | shares |  |  | 0.303 |  |  |  |  |  |  |  |  |  |  |
Repayment of First Data debt |  |  | $ 16,414,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected to be tax deductible |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  |  | 552,000,000 |  |  |  |  |  |
Measurement period adjustment, intangible assets |  |  |  |  |  |  |  | 396,000,000 |  |  |  |  |  |
Measurement period adjustment, noncontrolling interests |  |  |  |  |  |  |  | 776,000,000 |  |  |  |  |  |
Measurement period adjustment, recognized deferred tax liabilities |  |  |  |  |  |  |  | 147,000,000 |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 4,100,000,000 |  |  |  |
Operating income of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |  |
Transaction expenses |  |  |  |  |  |  |  |  |  | 175,000,000 |  |  |  |
Payments for acquisitions of businesses |  |  | 46,475,000,000 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  | 16,424,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 30,507,000,000 |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  | 3,535,000,000 |  |  |  |  |  |  |  |  |  |  |
First Data | Customer related intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  | 13,613,000,000 |  |  |  |  |  |  |  |  |  |  |
First Data | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  | $ 490,000,000 |  |  |  |  |  |  |  |  |  |  |
Elan Financial Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  |  |  | $ (24,000,000) |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 176,000,000 | 29,000,000 |  |  |
Operating income of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 8,000,000 | 6,000,000 |  |  |
Payments for acquisitions of businesses |  |  |  | $ 659,000,000 |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  |  | 691,000,000 |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  |  | 57,000,000 |  |  |  |  |  |  |  |  |  |
Earn-out provisions, fair value |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |
Future payments under a transition services agreement |  |  |  | $ 13,000,000 |  |  |  |  |  |  |  |  |  |
Transition services agreement term (in years) |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Acquired intangible asset amortization |  |  |  |  |  |  |  |  |  | 37,000,000 | 4,000,000 |  |  |
Finite-lived intangibles assets |  |  |  |  |  |  |  |  | 373,000,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 214,000,000 |  |  |  |  |
Elan Financial Services | Customer related intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  |  |  |  |  |  |  | 370,000,000 |  |  |  |  |
Elan Financial Services | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected to be tax deductible |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |  | 384,000,000 |  |
Earn-out provisions, fair value |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |
Number of acquisitions | acquisition |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Cash acquired from acquisitions |  |  |  |  |  |  |  |  |  |  |  | $ 33,000,000 |  |
Finite-lived intangibles assets |  |  |  |  |  |  |  |  |  |  |  | 163,000,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 217,000,000 |  |
Other identifiable net assets |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Series of Individually Immaterial Business Acquisitions | Customer related intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles assets |  |  |  |  |  |  |  |  |  |  |  | 92,000,000 |  |
Common Stock | First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued for acquisition (in shares) | shares |  |  | 286,000,000 |  |  |  |  |  |  |  |  |  |  |
Equity Awards | First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued for acquisition (in shares) | shares |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expenses | First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction expenses |  |  |  |  |  |  |  |  |  | 77,000,000 |  |  |  |
Debt Financing Activities | First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction expenses |  |  |  |  |  |  |  |  |  | 98,000,000 |  |  |  |
Subsequent Event | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of business |  |  |  |  |  |  | $ 430,000,000 |  |  |  |  |  |  |
Consideration from sale of business | $ 591,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 3,749,000,000 |  | 3,749,000,000 |  | 3,749,000,000 | $ 3,996,000,000 | $ 3,757,000,000 |  |
Investment Services Business | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale of Investment Services business |  |  |  |  |  | 360,000,000 |  | 360,000,000 |  | 360,000,000 |  |  |  |
Liabilities held for sale of Investment Services business |  |  |  |  |  | $ 43,000,000 |  | $ 43,000,000 |  | $ 43,000,000 |  |  |  |
Investment Services Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Services Business | Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  | 60.00% |  |  |  | 60.00% |  |  |  |  |  |  |  |
Investment Services Business | Payments | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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