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Debt - Schedule of Debt (Details) - USD ($) | Jun. 30, 2020 | May 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |  |  |  |
Fair value of interest rate swap agreements | $ 0 |  |  |  | $ (1,000,000)
Total senior notes | 15,066,000,000 |  |  |  | 12,010,000,000
Mortgage notes payable | 52,000,000 |  |  |  | 54,000,000
Construction loan payable | 165,000,000 |  |  |  | 140,000,000
Finance leases and other | 139,000,000 |  |  |  | 122,000,000
Debt issuance costs | (147,000,000) |  |  |  | (143,000,000)
Total debt | 16,814,000,000 |  |  |  | 13,726,000,000
Less current portion | (106,000,000) |  |  |  | (88,000,000)
Long-term debt | 16,708,000,000 |  |  |  | 13,638,000,000
Revolving credit agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit agreement | 89,000,000 |  |  |  | 93,000,000
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount |  |  | $ 2,100,000,000 |  |
Term loan credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit agreement | 1,450,000,000 |  |  |  | 1,450,000,000
$1,000 million 4.75% Senior Notes, due May 15, 2022 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 1,000,000,000 |  |  |  |
Interest rate | 4.75% |  |  | 4.75% |
Senior notes | $ 1,005,000,000 |  |  |  | 1,004,000,000
$1,000 million 6.125% Senior Notes, due February 15, 2024 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 1,000,000,000 |  | $ 1,000,000,000 |  |
Interest rate | 6.125% |  | 6.125% |  |
Senior notes | $ 0 |  |  |  | 1,000,000,000
$2,200 million 4.75% Senior Notes, due January 15, 2025 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 2,200,000,000 |  | $ 2,200,000,000 |  |
Interest rate | 4.75% |  | 4.75% |  |
Senior notes | $ 2,234,000,000 |  |  |  | 2,228,000,000
$1,200 million 5.250% Senior Notes due April 1, 2025 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | 1,248,000,000 |  |  |  | 0
$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% |  |  |  |
Senior notes | $ 1,800,000,000 |  |  |  | 1,800,000,000
$2,500 million 4.25% Senior Notes due December 15, 2027 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 2,500,000 | $ 2,500,000,000 |  |  |
Interest rate | 4.25% | 4.25% |  |  |
Senior notes | $ 2,481,000,000 |  |  |  | 2,479,000,000
$3,500 million 4.625% Senior Notes due December 15, 2029 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 3,500,000 | $ 3,500,000,000 |  |  |
Interest rate | 4.625% | 4.625% |  |  |
Senior notes | $ 3,500,000,000 |  |  |  | 3,500,000,000
$2,000 million 3.375% Senior Notes due February 15, 2030 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 2,000,000 | $ 2,000,000,000 | $ 2,000,000,000 |  |
Interest rate | 3.375% | 3.375% | 3.375% |  |
Senior notes | $ 2,000,000,000 |  |  |  | 0
WellCare Health Plans, Inc. | $1,200 million 5.250% Senior Notes due April 1, 2025 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount |  |  |  | $ 1,200,000,000 |
Interest rate |  |  |  | 5.25% |
WellCare Health Plans, Inc. | $750 million 5.375% Senior Notes due August 15, 2026 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 750,000 |  |  | $ 750,000,000 |
Interest rate | 5.375% |  |  | 5.375% |
Senior notes | $ 798,000,000 |  |  |  | $ 0

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