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Summary of Significant Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 126 | $ 105 | $ 99
2020 | 109 |  |
2021 | 91 |  |
2022 | 74 |  |
2023 | 60 |  |
2024 | 45 |  |
Thereafter | 64 |  |
Total amortization | 443 |  |
Accumulated amortization on intangible assets | 633 | 572 |
Intangible assets by type | 481 | 713 |
Impairment of intangible assets (Excluding Goodwill) | $ 106 |  |
Customers relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived intangible asset, useful life | 10 years |  |
Intangible assets by type | $ 419 | 530 |
Technology and other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets by type | $ 24 | 40 |
Technology-Based Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived intangible asset, useful life | 5 years |  |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived intangible asset, useful life | 7 years |  |
Trade names and licenses |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets by type | $ 38 | $ 143 |

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