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v3.20.4

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Principles of Consolidation |  |  |
Maximum percentage of voting interest required to be held to be accounted for, under the cost method | 20.00% |  |
Land, Buildings, Equipment and Software |  |  |
Land, buildings, equipment and software, net of accumulated depreciation | $ 602 | $ 610 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 1,900 | 1,800 |
Depreciation and amortization expense for the year | $ 153 | $ 147 | $ 146
Minimum [Member] |  |  |
Principles of Consolidation |  |  |
Voting interest required for consolidation | 50.00% |  |
Percentage of voting interest required to be held to be accounted for under the equity method | 20.00% |  |
Land, Buildings, Equipment and Software |  |  |
Amortization periods | 3 years |  |
Lease renewal term | 1 year |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization periods | 3 years |  |
Maximum [Member] |  |  |
Principles of Consolidation |  |  |
Percentage of voting interest required to be held to be accounted for under the equity method | 50.00% |  |
Land, Buildings, Equipment and Software |  |  |
Amortization periods | 39 years |  |
Lease renewal term | 20 years |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization periods | 39 years |  |

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