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Borrowings and Credit Arrangements - Long-Term Borrowings (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 15, 2019 | Mar. 09, 2018 | Aug. 31, 2019 | Jul. 31, 2019 | May 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 28, 2018 | Dec. 15, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from derivative instruments |  |  |  | $ 25,000,000 |  |  |  |  | $ 25,000,000 | $ (446,000,000) | $ 0 |  |
Loss on net cash flow hedges |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |
Premium paid in excess of debt principal |  |  | $ 76,000,000 |  |  |  |  |  |  |  |  |  |
Debt extinguishment fees |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Gain on write off of unamortized deferred financing premiums |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 79,000,000 |  |  |  |  |  | 79,000,000 | 0 | $ 0 |  |
Proceeds from hedge transaction |  | $ 446,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain on hedge transaction |  | 331,000,000 |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  | $ 68,438,000,000 |  |  |  |
2018 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 40,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt |  | 39,400,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2.625% senior notes due August 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 2.625% |  |  |  |  |  |  |  | 2.265% |  |  |  |
Amount outstanding |  |  |  |  |  |  | $ 0 |  | $ 1,000,000,000 | 0 |  |  |
Senior Notes | 3.25% senior notes due August 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 3.25% |  |  |  |  |  |  |  | 3.25% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 0 |  | $ 1,750,000,000 | 0 |  |  |
Senior Notes | 2018 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 40,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.125% |  |  |  |  |  | 3.125% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | 2,000,000,000 |  | $ 723,000,000 | 2,000,000,000 |  |  |
Senior Notes | 3.35% senior notes due March 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.35% |  |  |  |  |  | 3.35% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 962,000,000 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | 3,000,000,000 |  | $ 2,038,000,000 | 3,000,000,000 |  |  |
Senior Notes | Floating rate notes due March 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.7% senior notes due March 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 6,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 3.70% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 6,000,000,000 |  | $ 6,000,000,000 | 6,000,000,000 |  |  |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 4.10% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 5,000,000,000 |  | $ 5,000,000,000 | 5,000,000,000 |  |  |
Senior Notes | 4.3% senior notes due March 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 9,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 4.30% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 9,000,000,000 |  | $ 9,000,000,000 | 9,000,000,000 |  |  |
Senior Notes | 4.78% senior notes due March 2038 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 4.78% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 5,000,000,000 |  | $ 5,000,000,000 | 5,000,000,000 |  |  |
Senior Notes | 5.05% senior notes due March 2048 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | 8,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 5.05% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 8,000,000,000 |  | $ 8,000,000,000 | 8,000,000,000 |  |  |
Senior Notes | 3% senior notes due August 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |  |
Amount outstanding |  |  |  |  |  |  | 0 |  | $ 750,000,000 | 0 |  |  |
Senior Notes | Outstanding Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 4,000,000,000.0 |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.125% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.125% |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 328,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.125% senior notes issued by Aetna due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.125% |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 297,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.45% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 5.45% |  |  |  |  |  | 5.45% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 413,000,000 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | $ 600,000,000 |  | $ 187,000,000 | $ 600,000,000 |  |  |
Notes Payable | Floating rate notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 3.397% |  | 2.515% | 3.397% |  |  |
Aggregate principal of debt extinguished |  |  | $ 723,000,000 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | $ 1,000,000,000 |  | $ 277,000,000 | $ 1,000,000,000 |  |  |
Notes Payable | Floating rate notes due March 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 3.487% |  | 2.605% | 3.487% |  |  |
Amount outstanding |  |  |  |  |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  |
Notes Payable | 3-Year and 5-Year Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0 |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0
Notes Payable | 3-year tranche term loan due November 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0 |
Debt instrument term |  |  |  |  |  |  |  | 3 years |  | 3 years |  |  |
Repayment of debt |  |  |  | $ 1,500,000,000 | $ 1,000,000,000.0 | $ 500,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | 3,000,000,000 |  | $ 0 | $ 3,000,000,000 |  |  |
Notes Payable | 5-Year tranche loan due November 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000.0 |
Debt instrument term |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Repayment of debt |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |  |
Aetna Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed debt |  |  |  |  |  |  |  |  |  |  |  | $ 8,098,000,000 |
Minimum | Aetna Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.20% |
Maximum | Aetna Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.75% |

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