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Summary of Significant Accounting Policies - Performance Obligation (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Remaining performance obligation | $ 5,180 | $ 5,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Percent of remaining performance obligation expected to be recognized |  | 59.50%
Recognition period for remaining performance obligation |  | 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Percent of remaining performance obligation expected to be recognized | 61.00% |
Recognition period for remaining performance obligation | 12 months |

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