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Debt - Additional Information (Details) € in Millions, £ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2019 USD ($) | Feb. 15, 2019 USD ($) | Feb. 06, 2019 | Sep. 26, 2018 USD ($) | Jun. 30, 2019 USD ($) | Oct. 31, 2018 | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 13, 2020 USD ($) | Jul. 01, 2019 GBP (£) | Jun. 24, 2019 USD ($) | Jun. 24, 2019 EUR (€) | Jan. 16, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 0.04625% | 0.04625% |  |  |  |  |  |  |  |
Current debt outstanding |  |  |  |  |  |  |  | $ 384,000,000 | $ 287,000,000 |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  | 811,000,000 | 773,000,000 |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | 20,839,000,000 |  |  |  |  |  |  |
Debt costs |  |  |  |  |  |  |  | 0 | 47,000,000 | $ 14,000,000 |  |  |  |  |
Tender offer |  |  |  | $ 246,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current debt outstanding |  |  |  |  |  |  |  | $ 144,000,000 | $ 150,000,000 |  |  |  |  |  |
Foreign Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate percentage |  |  |  |  |  |  |  | 21.98% | 13.42% |  |  |  |  |  |
Foreign currency forward exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000,000 |  |
Realized foreign currency transaction gains (losses) |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |
Foreign currency foreign exchange contracts - Euro and British pound denominated senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,500 |
Realized foreign currency transaction gains (losses) |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  |  |  |
Foreign currency foreign exchange contracts - Euro and British pound denominated cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 1,050 |  |  |
Realized foreign currency transaction gains (losses) |  |  |  |  |  |  |  |  | 19,000,000 |  |  |  |  |  |
First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of First Data debt | $ 16,414,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repaid debt |  |  |  |  |  |  | $ 1,100,000,000 | $ 1,100,000,000 |  |  |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  |  |  |  | 3.5 |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | 5,000,000 | 7,000,000 |  |  |  |  |  |
Revolving credit facility | Debt Instrument, Option, One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Debt Instrument, Option, Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  | 4.5 |  |  |  |  |  |  |  |  |  |  |  |
Bridge Loan | Senior Unsecured Bridge Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,000,000,000.0
Debt costs |  |  |  |  |  |  |  | 98,000,000 |  |  |  |  |  |  |
Line of Credit | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 18,300,000,000 |  |  |  |  |  |  |
Line of Credit | Senior notes | 4.200% senior notes due October 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  | 4.20% |  |  |  |  |  |  |  |
Line of Credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | $ 790,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 22,000,000 | 174,000,000 |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  |  | 1.18% |  |  |  |  |  |  |
Line of Credit | Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 1,250,000,000 | 3,950,000,000 |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  |  | 1.41% |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 5,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility | Debt Instrument, Amortization, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility | Debt Instrument, Amortization, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  | 1.875% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility | Debt Instrument, Amortization, Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility, Loans With Three Year Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility | Senior Unsecured Term Loan Facility, Loans With Five Year Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  | $ 2,000,000,000.0 |  |  |  |
Repaid debt |  |  |  |  |  |  |  | $ 540,000,000 |  |  |  |  |  |  |
Senior notes | 2.250% senior notes due June 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 2.25% |  |  | 2.25% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 1,000,000,000 | 0 |  |  |  |  |  |
Senior notes | 2.650% senior notes due June 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 2.65% |  |  | 2.65% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 1,000,000,000 | 0 |  |  |  |  |  |
Senior notes | 2.700% senior notes due June 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 2.70% |  |  |  |  |  |  |
Repaid debt |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 0 | 850,000,000 |  |  |  |  |  |
Senior notes | 4.750% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 4.75% |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |  |  |  |  |
Senior notes | 3.800% senior notes due October 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.80% |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  | 3.80% |  |  |  |  |  |  |  |
Senior notes | 4.200% senior notes due October 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 4.20% |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |
Senior notes | 4.625% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 204,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  | $ (14,000,000) |  |  |  |  |
Receivable securitized loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | $ 425,000,000 | $ 500,000,000 |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  |  | 1.00% | 2.61% |  |  |  |  |  |
Receivable securitized loan | 2.9% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  | 425,000,000 | $ 500,000,000 |  |  |  |  |  |
Maximum collateral capacity |  |  |  |  |  |  |  | 625,000,000 |  |  |  |  |  |  |
Term loan and senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | $ 117,000,000 | $ 120,000,000 |  |  |  |  |  |

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