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Indebtedness - Schedule of Notes Maturity (Details) - Unsecured Senior Notes $ in Millions | Mar. 31, 2019 USD ($)
--- | ---
Debt Instrument [Line Items] |
2019 | $ 0
2020 | 0
2021 | 592
2022 | 206
2023 | 950
Thereafter | 750
Total | $ 2,498

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