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Debt - Narrative (Details) £ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2021 USD ($) | Jul. 31, 2021 GBP (£) | Apr. 30, 2021 | Feb. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) | Oct. 31, 2017 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jul. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 79,000,000 |  |  | $ 46,000,000 |  |  |  | $ (125,000,000) | $ (44,000,000) |  |
Payments for foreign currency hedge | £ |  | £ 509 |  |  |  |  |  |  |  |  |
Extension term |  |  | 1 year |  |  |  |  |  |  |  |
Construction loan payable |  |  |  |  |  |  |  | 188,000,000 |  |  | $ 180,000,000
Repayment of mortgage note |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
Debt Instrument, Payment Period, One |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 0.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Payment Period, Two |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 2.50% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Payment Period, Three |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.00% |  |  |  |  |  |  |  |  |  |
Foreign currency swap agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative agreement |  |  |  |  |  |  |  |  |  | $ 705,000,000 |
Fair value, swap agreement |  |  |  |  |  |  |  | 18,000,000 |  |  |
Circle Health |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition, interests acquired |  |  |  |  |  |  |  |  |  | 60.00% |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |
Construction Loan Payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 200,000,000 |  |  |  |  |
Construction Loan Payable | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.70% |  |  |  |  |
Construction Loan Payable | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |
Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.14%
$2,200 million 2.50% Senior Notes due March 1, 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 2,200,000,000 |  |  |  | $ 2,200,000,000 |  |  |
Interest rate |  |  |  | 2.50% |  |  |  | 2.50% |  |  |
$2,200 million 4.75% Senior Notes, due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 2,200,000,000 |  |  |  | $ 2,200,000,000 |  |  |
Interest rate |  |  |  | 4.75% |  |  |  | 4.75% |  |  |
Notes accepted for Tender Offer, principal outstanding, percentage |  |  |  | 36.00% |  |  |  |  |  |  |
$1,800 Million 2.45% Senior Notes due March 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 500,000,000 |  |  |  |  |  |  |  |  | $ 1,800,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  | 2.45% |
Yield, percentage | 2.31% |  |  |  |  |  |  |  |  |  |
$1,300 million 2.625% Senior Notes due August 1, 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 1,300,000,000 |  |  |  |  |  |  | $ 1,300,000,000 |  |  |
Interest rate | 2.625% |  |  |  |  |  |  | 2.625% |  |  |
$1,800 million 5.375% Senior Notes due June 1, 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  |
Interest rate | 5.375% |  |  |  |  |  |  | 5.375% |  |  |
Term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 2,200,000,000 |  |  |  |  |  | $ 1,450,000,000 |  |  |  |
Covenant, maximum net leverage ratio, | 4.00 |  |  |  |  |  | 3.50 |  |  |  |
Term loan facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |  |  |
Term loan facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.125% |  |  |  |  |  |  |  |  |  |

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