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Indebtedness - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |
Loss on redemption of unsecured senior notes |  | $ 52 | $ 0
Unsecured senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Maximum percentage redeemable on unsecured debt |  | 40.00% |
Unsecured senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  | $ 100 |
Amount of principal amount outstanding repaid | $ 950 | 1,548 |
Loss on redemption of unsecured senior notes | $ 53 | $ 52 |

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- Definition Maximum percentage redeemable of aggregate principal on unsecured debt with the net proceeds of certain equity offerings at a fixed redemption prices, plus accrued and unpaid interest and additional interest, if any, to the redemption dates, subject to compliance with certain conditions. + References No definition available. + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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