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Borrowings and Credit Agreements - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2018 | Mar. 09, 2018 | Dec. 03, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 15, 2017
Borrowings and Credit Agreements |  |  |  |  |  |  |
Carrying amount of long-term debt |  |  |  | $ 62,900,000,000 | $ 62,900,000,000 |  |
Aetna Acquisition |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Redemption percentage |  |  |  |  | 101.00% |  |
Unsecured senior notes of $40 billion |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 40,000,000,000 |  |  |  |  |
Proceeds from issuance of debt |  | 39,400,000,000 |  |  |  |  |
Carrying amount of long-term debt |  | 40,000,000,000 |  |  |  |  |
3.125% senior notes due 2020 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 2,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 3.125% |  |  |  |  |
Floating rate notes due 2020 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,000,000,000 |  |  |  |  |
3.35% senior notes due 2021 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 3,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 3.35% |  |  |  |  |
Floating rate notes due 2021 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,000,000,000 |  |  |  |  |
3.7% senior notes due 2023 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 6,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 3.70% |  |  |  |  |
4.1% senior notes due 2025 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 5,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 4.10% |  |  |  |  |
4.3% senior notes due 2028 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 9,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 4.30% |  |  |  |  |
4.78% senior notes due 2038 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 5,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 4.78% |  |  |  |  |
5.05% senior notes due 2048 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 8,000,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 5.05% |  |  |  |  |
Term loan in connection with Aetna purchase | Aetna Acquisition |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 5,000,000,000
Unsecured Backup Credit Facilities |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 0.03% |  |
Long-term line of credit |  |  |  | 0 | $ 0 | $ 0 |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring May 16 2019 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,750,000,000 | $ 1,750,000,000 |  |
Line of credit facility term (in years) |  |  |  |  | 364 days |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring May 17 2023 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 2,000,000,000 | $ 2,000,000,000 |  |
Line of credit facility term (in years) |  |  |  |  | 5 years |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring July 1, 2020 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,250,000,000 | $ 1,250,000,000 |  |
Line of credit facility term (in years) |  |  |  |  | 5 years |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring May 18, 2022 |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,000,000,000 | $ 1,000,000,000 |  |
Line of credit facility term (in years) |  |  |  |  | 5 years |  |
Unsecured Debt | Unsecured Bridge Loan | Aetna Acquisition |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |
Debt issuance fees paid |  |  | $ 221,000,000 |  |  |  |
Bridge loan term (in years) | 364 days |  |  |  |  |  |
Amortization of loan facility fees |  |  |  | $ 2,000,000 | $ 171,000,000 |  |
Debt instrument, face amount | $ 4,000,000,000 |  | $ 49,000,000,000 |  |  |  | $ 44,000,000,000
Carrying amount of long-term debt |  | $ 4,000,000,000 |  |  |  |  |
Extension fees paid for extension of bridge loan facility |  | $ 8,000,000 |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 + Details
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