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Real Estate Transactions - 2021 Real Estate Investment Acquisitions (Details) $ in Millions | 1 Months Ended | 12 Months Ended
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Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) a property | Oct. 31, 2021 USD ($) property | Sep. 30, 2021 USD ($) property | Jul. 31, 2021 USD ($) property | Jun. 30, 2021 USD ($) property | Apr. 30, 2021 USD ($) property | Feb. 28, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) a property | Dec. 31, 2020 property
MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  | $ 54 |  |  |
CALIFORNIA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of land | a |  | 12 |  |  |  |  |  |  |  |  | 12 |
Payments to acquire land |  |  |  |  |  |  |  |  |  |  | $ 128 |
Number of adjacent sites currently held | property |  |  |  |  |  |  |  |  |  |  | 2 |
Medical Office |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  |  | 2 | 7
Medical Office | Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 142 |  |  |  |  |
Medical Office | TENNESSEE |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  | 1 |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  | $ 13 |  |  |  |
Medical Office | COLORADO |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  | 1 |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 38 |  |  |  |  |
Medical Office | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  | 14 |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 371 |  |  |  |  |
Medical Office | FLORIDA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  | 1 |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  | $ 16 |  |  |  |  |  |
Medical Office | KANSAS |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 50 |  |  |  |  |  |  |
Medical Office | NEW JERSEY |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 3 |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 155 |  |  |  |  |  |  |
Medical Office | TEXAS |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 2 |  |  |  |  | 1 |  |  |
Payments to acquire real estate |  |  |  | $ 60 |  |  |  |  | $ 34 |  |  |
Medical Office | MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 80 |  |  |  |  |  |  |  |  |
Medical Office | WASHINGTON |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 43 |  |  |  |  |  |  |  |  |
Medical Office | LOUISIANA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 34 |  |  |  |  |  |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  |  |  | 3
Life science | MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 2 |  | 3 |  |  |  |  | 3 |  |  |
Payments to acquire real estate |  | $ 45 | 73 | $ 180 |  |  |  |  | $ 610 | $ 320 |  |
Life science | MASSACHUSETTS | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 72 |  |  |  |  |  |  |  |  |  |  |
Life science | MASSACHUSETTS | Mooney Street Parcels |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | 123 |  |  |  |  |  |  |  |  |
Life science | MASSACHUSETTS | 25 Spinelli |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | 34 |  |  |  |  |  |  |  |  |
Life science | MASSACHUSETTS | 68 Moulton |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | 18 |  |  |  |  |  |  |  |  |
Life science | CALIFORNIA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 20 |  |  |  |  |  |  |  |  |
Life science | CALIFORNIA | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 24 |  |  |  |  |  |  |  |  |  |  |

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