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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized | $ 2,962 | $ 3,167 | $ 2,689 | $ 2,757 | $ 2,791 | $ 3,084 | $ 3,035 | $ 2,755 | $ 11,575 | $ 11,665 | $ 11,151
Revenue recognized related to contract liabilities |  |  |  |  |  |  |  |  |  | 5 |
Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | 5,975 | 5,724 |
Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | $ 5,600 | $ 5,941 |

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