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Debt - Additional Information (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2019 USD ($) | Jun. 24, 2019 USD ($) | Feb. 15, 2019 USD ($) | Feb. 06, 2019 | Jan. 16, 2019 USD ($) | Sep. 26, 2018 USD ($) | Oct. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 01, 2019 GBP (£) | Jul. 01, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt costs |  |  |  |  |  |  |  |  | $ 47,000,000 | $ 14,000,000 | $ 0 |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  | 773,000,000 |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 22,059,000,000 |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 9,000,000,000.0 |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  | £ 1,050,000,000.00 | € 1,500,000,000
Extinguishment of debt |  |  |  |  |  | $ 246,000,000 |  |  |  |  |  |  |
Interest rate increase in the event the Company's credit rating is downgraded below investment grade (as percent) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
Senior notes | 2.75% senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 2.75% |  |  |  |  |  |  | 2.75% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 2,000,000,000 | 0 |  |  |
Senior notes | 3.2% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 3.20% |  |  |  |  |  |  | 3.20% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 2,000,000,000 | 0 |  |  |
Senior notes | 3.5% senior notes due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  | $ 3,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 3.50% |  |  |  |  |  |  | 3.50% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 3,000,000,000 | 0 |  |  |
Senior notes | 4.4% senior notes due 2049 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 4.40% |  |  |  |  |  |  | 4.40% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 2,000,000,000 | 0 |  |  |
Senior notes | 0.375% senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt | € |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 3.75% |  |  | 0.375% | 0.375%
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 559,000,000 | 0 |  |  |
Senior notes | 1.125% senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt | € |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 1.125% |  |  | 1.125% | 1.125%
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 559,000,000 | 0 |  |  |
Senior notes | 1.625% senior notes due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt | € |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 1.625% |  |  | 1.625% | 1.625%
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 559,000,000 | 0 |  |  |
Senior notes | 2.25% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt | £ |  |  |  |  |  |  |  |  |  |  |  | £ 525,000,000 |
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 2.25% |  |  | 2.25% | 2.25%
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 687,000,000 | 0 |  |  |
Senior notes | 3.0% senior notes due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt | £ |  |  |  |  |  |  |  |  |  |  |  | £ 525,000,000 |
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 3.00% |  |  | 3.00% | 3.00%
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 687,000,000 | 0 |  |  |
Senior notes | 3.8% senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.80% | 3.80% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 1,000,000,000 | 1,000,000,000 |  |  |
Senior notes | 4.2% senior notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 4.20% | 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 |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 4.625% | 4.625% |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 204,000,000 |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |
Senior notes | 2.7% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 2.70% | 2.70% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 850,000,000 | 850,000,000 |  |  |
Senior notes | 3.85% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.85% | 3.85% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 900,000,000 | 900,000,000 |  |  |
Senior notes | 4.75% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 4.75% | 4.75% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |  |
Senior notes | 3.5% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 3.50% | 3.50% |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 700,000,000 | 700,000,000 |  |  |
Senior notes | 2.9% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  | 2.70% |  |  |  |
Receivable securitized loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 500,000,000 | 0 |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.61% |  |  |  |
Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repaid debt |  |  |  |  |  |  |  | $ 540,000,000 |  |  |  |  |
Term loan and senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | $ 120,000,000 | 25,000,000 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repaid debt |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  |  |  |  |  | 3.5 |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | $ 7,000,000 | 5,000,000 |  |  |
Revolving credit facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 790,000,000 |  |  |  |  |  |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.68% |  |  |  |
Revolving credit, increase limit |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 174,000,000 | 1,129,000,000 |  |  |
Term loan facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings with receivables used as collateral |  |  |  |  |  |  |  |  | $ 3,950,000,000 | $ 0 |  |  |
Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 5,000,000,000.0 |  |  |  |  |  |  |  |  |  |
Variable interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility, Loans With Three Year Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility, Loans With Five Year Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | Bridge Loan | Senior Unsecured Bridge Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  | 364 days |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 17,000,000,000.0 |  |  |  |  |  |  |  |
Debt costs |  |  |  |  |  |  |  |  | $ 98,000,000 |  |  |  |
Foreign Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding on lines of credit |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |
Weighted average interest rate percentage |  |  |  |  |  |  |  |  | 13.40% |  |  |  |
Debt Instrument, Option, One | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  |  | 4 |  |  |  |  |  |  |  |  |
Debt Instrument, Option, Two | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness to consolidated net earnings limit |  |  |  | 4.5 |  |  |  |  |  |  |  |  |
Foreign currency forward exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized foreign currency transaction gains (losses) |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  |
Foreign currency foreign exchange contracts - Euro and British pound denominated cash |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized foreign currency transaction gains (losses) |  |  |  |  |  |  |  |  | $ (19,000,000) |  |  |  |
First Data |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of First Data debt | $ 16,414,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amortization, Period One | Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  |  | 1.25% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amortization, Period Two | Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  |  | 1.875% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amortization, Period Three | Term loan facility | Line of Credit | Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization rate (as a percent) |  |  | 2.50% |  |  |  |  |  |  |  |  |  |

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