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Business Segment and Geographic Information (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Division Countries | Dec. 31, 2019 USD ($) Countries | Dec. 31, 2018 Countries
Segment Reporting Information [Line Items] |  |  |
Number of business segments | Division | 2 |  |
Maximum Percentage Revenue from One Geographic Segment | 10.00% | 10.00% | 10.00%
Maximum Percentage Property Plant and Equipment from One Geographic Segment | 10.00% | 10.00% |
Number of Countries Exceed Revenue Threshold | Countries | 1 | 1 | 1
Number of Countries Exceed Property Plant and Equipment Threshold | Countries | 1 | 1 |
Long-term debt | $ | $ 9,132 | $ 10,316 |
Senior notes due March 2030 |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-term debt | $ | $ 1,000 | $ 0 |
Property, Plant and Equipment [Member] | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 49.00% | 59.00% |
Revenue Benchmark [Member] | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 38.00% | 51.00% | 58.00%

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