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Debt - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Jul. 01, 2018 | Jul. 01, 2018 | May 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 5,000 | $ 5,000 |  |
Percentage of owned subsidiaries guaranteed fixed- and floating-rate notes |  |  | 100.00% |  |
Fixed Rate Notes Due May 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  | 2,000 | $ 2,000 |  | $ 0
Fixed Rate Notes Due May 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  | 2,000 | 2,000 |  | 0
Credit Facility | 364-day Committed Bank Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 2,000 | 2,000 |  |
Debt instrument term |  | 364 days |  |  |
Credit Facility | 364-day Committed Bank Credit Facility | CSRA |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings from line of credit | $ 7,500 |  |  |  |
Commercial Paper |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 2,800 | $ 2,800 |  |
Weighted average interest rate |  | 2.137% | 2.137% |  |
LIBOR | Floating Rate Notes Due May 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  | $ 500 | $ 500 |  | 0
LIBOR | Floating Rate Notes Due May 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  | 500 | 500 |  | $ 0
Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 7,500 |
Notes | LIBOR | Floating Rate Notes Due May 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  |  |  | 500 |
Notes | LIBOR | Floating Rate Notes Due May 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  |  |  | $ 500 |
Credit Facility | Multi-year Facility Expiring November 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 1,000 | 1,000 |  |
Credit Facility | Multi-year Facility Expiring March 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 2,000 | $ 2,000 |  |

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- Definition Percentage Of Owned Subsidiaries Guaranteed Fixed- And Floating-Rate Notes + References No definition available. + Details
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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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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 of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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