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Borrowings and Credit Arrangements - Long-Term Borrowings (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 | Aug. 15, 2019 | Dec. 31, 2020 | Aug. 31, 2020 | Aug. 31, 2019 | Jul. 31, 2019 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 16, 2020 | Nov. 28, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt | $ 3,970,000,000 | $ 3,460,000,000 |  |  |  |  | $ 3,950,000,000 | $ 1,990,000,000 |  |  |  |
Proceeds from derivative instruments |  |  |  |  |  | $ 25,000,000 | 7,000,000 | 7,000,000 | $ 25,000,000 | $ (446,000,000) |  |
Loss on net cash flow hedges |  |  |  |  |  | $ 18,000,000 | 5,000,000 |  |  |  |  |
Premium paid in excess of debt principal |  |  | $ 619,000,000 | $ 706,000,000 | $ 76,000,000 |  |  |  |  |  |  |
Gain on write off of unamortized deferred financing premiums |  |  | (45,000,000) | (47,000,000) | (5,000,000) |  |  |  |  |  |  |
Debt extinguishment fees |  |  | 10,000,000 | 13,000,000 | 8,000,000 |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | 674,000,000 | 766,000,000 | 79,000,000 |  |  | 1,440,000,000 | 79,000,000 | $ 0 |  |
Amount outstanding |  |  | 64,235,000,000 |  |  |  |  | 64,235,000,000 |  |  |  |
Senior Notes | 1.3% senior notes due August 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 1,500,000,000 |  | $ 750,000,000 |  |  |  |  | $ 750,000,000 |  |  | $ 750,000,000 |
Debt interest rate |  |  | 1.30% |  |  |  |  | 1.30% |  |  | 1.30% |
Senior Notes | 1.875%, senior notes due February 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 1,250,000,000 |  |  |  |  | $ 1,250,000,000 |  |  |  |
Debt interest rate |  |  | 1.875% |  |  |  |  | 1.875% |  |  |  |
Senior Notes | 1.75% senior notes due August 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 1.75% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2.7% senior notes due August 2040 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 2.70% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.625% senior notes due April 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 3.625% |  |  |  |  |
Senior Notes | 3.75% senior notes due April 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 3.75% |  |  |  |  |
Senior Notes | 4.125% senior notes due April 2040 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 4.125% |  |  |  |  |
Senior Notes | 4.25% senior notes due April 2050 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 4.25% |  |  |  |  |
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% | 2.625% |  |  |  |  | 2.625% |  |  |  |
Amount outstanding |  |  | $ 1,000,000,000 |  |  |  |  | $ 1,000,000,000 | 1,000,000,000 |  |  |
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% |  |  |  |  | 3.00% |  |  |  |
Amount outstanding |  |  | $ 750,000,000 |  |  |  |  | $ 750,000,000 | 750,000,000 |  |  |
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% |  |  |  |  | 3.25% |  |  |  |
Amount outstanding |  |  | $ 1,750,000,000 |  |  |  |  | $ 1,750,000,000 | 1,750,000,000 |  |  |
Senior Notes | Outstanding Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 4,500,000,000 | $ 6,000,000,000.0 | $ 4,000,000,000.0 |  |  |  |  |  |  |
Senior Notes | 4% senior notes due December 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.00% | 4.00% |  |  |  | 4.00% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 113,000,000 | $ 723,000,000 |  |  |  |  |  |  |  |
Amount outstanding |  |  | $ 414,000,000 |  |  |  |  | $ 414,000,000 | 1,250,000,000 |  |  |
Senior Notes | 3.7% senior notes due March 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.70% | 3.70% |  |  |  | 3.70% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 1,400,000,000 | $ 2,300,000,000 |  |  |  |  |  |  |  |
Amount outstanding |  |  | $ 2,336,000,000 |  |  |  |  | $ 2,336,000,000 | 6,000,000,000 |  |  |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.10% | 4.10% |  |  |  | 4.10% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 1,000,000,000.0 | $ 3,000,000,000.0 |  |  |  |  |  |  |  |
Amount outstanding |  |  | $ 950,000,000 |  |  |  |  | $ 950,000,000 | 5,000,000,000 |  |  |
Senior Notes | 4.3% senior notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.30% |  |  |  |  | 4.30% |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.125% |  | 3.125% |  |  | 3.125% |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  | $ 0 |  |  |  |  | $ 0 | 723,000,000 |  |  |
Senior Notes | 4.125% senior notes due May 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.125% |  | 4.125% |  |  | 4.125% |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 328,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  | $ 222,000,000 |  |  |  |  | $ 222,000,000 | 222,000,000 |  |  |
Senior Notes | 4.125% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.125% |  | 4.125% |  |  | 4.125% |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 297,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  | $ 203,000,000 |  |  |  |  | $ 203,000,000 | 203,000,000 |  |  |
Senior Notes | 5.45% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 5.45% |  | 5.45% |  |  | 5.45% |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 413,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  | $ 187,000,000 |  |  |  |  | $ 187,000,000 | 187,000,000 |  |  |
Senior Notes | 3.35% senior notes due March 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 3.35% |  | 3.35% |  |  | 3.35% |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 962,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  | $ 2,038,000,000 |  |  |  |  | $ 2,038,000,000 | $ 2,038,000,000 |  |  |
Notes Payable | Floating rate notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 2.515% |  |  |
Amount outstanding |  |  | $ 0 |  |  |  |  | $ 0 | $ 277,000,000 |  |  |
Floating Rate Notes | Floating rate notes due March 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 723,000,000 |  |  |  |  |  |  |
Aetna Inc. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assumed debt |  |  |  |  |  |  |  |  |  |  |  | $ 8,098,000,000

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