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Debt - Long-Term Borrowings (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2018 | Dec. 15, 2017 | Jul. 27, 2016 | May 31, 2016 | May 16, 2016 | Dec. 31, 2018 | Nov. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 28, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0
Proceeds from debt net of issuance costs |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |
Proceeds form derivative instruments |  |  |  |  |  |  |  | $ 446,000,000 |  |  |
Unrealized gain (loss) on derivatives, net of tax |  |  |  |  |  |  |  | 331,000,000 |  |  |
Gain (loss) to be reclassified during next 12 months |  |  |  |  |  | $ 18,000,000 |  | 18,000,000 |  |  |
Long-term debt gross |  |  |  |  |  | 74,265,000,000 |  | 74,265,000,000 | $ 27,170,000,000 |  |
Loss on extinguishment of debt before write off |  |  | $ 97,000,000 | $ 486,000,000 |  |  |  |  |  |  |
Write off of debt issuance cost |  |  | 4,000,000 | 50,000,000 |  |  |  |  |  |  |
Debt extinguishment fees |  |  |  | 6,000,000 |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | 101,000,000 | 542,000,000 |  |  |  | 0 | 0 | $ 643,000,000 |
2018 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 40,000,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from debt net of issuance costs | 39,400,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 2018 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 40,000,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 2,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 2,000,000,000 |  | $ 2,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 3.125% |  | 3.125% |  |  |
Senior Notes | 3.35% senior notes due March 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 3,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 3,000,000,000 |  | $ 3,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 3.35% |  | 3.35% |  |  |
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 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 6,000,000,000 |  | $ 6,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 3.70% |  | 3.70% |  |  |
Senior Notes | 4.3% senior notes due March 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 9,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 9,000,000,000 |  | $ 9,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 4.30% |  | 4.30% |  |  |
Senior Notes | 4.78% senior notes due March 2038 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 5,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 5,000,000,000 |  | $ 5,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 4.78% |  | 4.78% |  |  |
Senior Notes | 5.05% senior notes due March 2048 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 8,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 8,000,000,000 |  | $ 8,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 5.05% |  | 5.05% |  |  |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | 5,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 5,000,000,000 |  | $ 5,000,000,000 | 0 |  |
Debt interest rate |  |  |  |  |  | 4.10% |  | 4.10% |  |  |
Senior Notes | 3-Year tranche loan due November 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  |  |  |  | 3 years |  |  |
Senior Notes | 2.125% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 1,750,000,000.00 |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 1,750,000,000 |  | $ 1,750,000,000 | 1,750,000,000 |  |
Debt interest rate |  |  |  |  | 2.125% | 2.125% |  | 2.125% |  |  |
Senior Notes | 2.875% senior notes due June 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 1,750,000,000 |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 1,750,000,000 |  | $ 1,750,000,000 | 1,750,000,000 |  |
Debt interest rate |  |  |  |  | 2.875% | 2.875% |  | 2.875% |  |  |
Senior Notes | Any And All Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 1,100,000,000 | 835,000,000 |  |  |  |  |  |  |
Senior Notes | Senior Notes, 5.75% Due 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 5.75% |  |  |  |  |  |
Senior Notes | Senior Notes, 6.60% Due 2019 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 6.60% |  |  |  |  |  |
Senior Notes | Senior Notes, 4.75% Due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 4.75% |  |  |  |  |  |
Senior Notes | Maximum Tender Offer Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 2,250,000,000 | $ 1,500,000,000.0 |  |  |  |  |  |
Senior Notes | 4.75% senior notes due December 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 399,000,000 |  | $ 399,000,000 | 399,000,000 |  |
Debt interest rate |  |  |  |  | 4.75% | 4.75% |  | 4.75% |  |  |
Senior Notes | 5% senior notes due December 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 299,000,000 |  | $ 299,000,000 | 299,000,000 |  |
Debt interest rate |  |  |  |  | 5.00% | 5.00% |  | 5.00% |  |  |
Senior Notes | 3.875% senior notes due July 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 2,828,000,000 |  | $ 2,828,000,000 | 2,828,000,000 |  |
Debt interest rate |  |  |  |  | 3.875% | 3.875% |  | 3.875% |  |  |
Senior Notes | 6.25% senior notes due June 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 372,000,000 |  | $ 372,000,000 | 372,000,000 |  |
Debt interest rate |  |  |  |  | 6.25% | 6.25% |  | 6.25% |  |  |
Senior Notes | 4.875% senior notes due July 2035 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 652,000,000 |  | $ 652,000,000 | 652,000,000 |  |
Debt interest rate |  |  |  |  | 4.875% | 4.875% |  | 4.875% |  |  |
Senior Notes | 6.125% senior notes due September 2039 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 447,000,000 |  | $ 447,000,000 | 447,000,000 |  |
Debt interest rate |  |  |  |  | 6.125% | 6.125% |  | 6.125% |  |  |
Senior Notes | 5.75% senior notes due May 2041 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 133,000,000 |  | $ 133,000,000 | 133,000,000 |  |
Debt interest rate |  |  |  |  | 5.75% | 5.75% |  | 5.75% |  |  |
Notes Payable | Floating rate notes due March 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 | 0 |  |
Notes Payable | Floating rate notes due March 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  | 1,000,000,000 |  | 1,000,000,000 | 0 |  |
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 |  |  |  |  |  |  |  |  |
Notes Payable | 3-Year tranche loan due November 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0
Maximum borrowing capacity |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |
Debt term |  | 3 years |  |  |  |  | 3 years |  |  |  |
Long-term debt gross |  |  |  |  |  | 3,000,000,000 |  | $ 3,000,000,000 | $ 0 |  |
Notes Payable | 5-Year tranche loan due November 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |  | 5 years |  |  |  |
Repayments of Debt |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |
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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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