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Notes Payable, Long-Term Debt and Available Credit Facilities (Narrative) (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 22, 2019 | May 02, 2017 USD ($) | Jan. 31, 2017 USD ($) | Mar. 22, 2016 USD ($) borrowings
Term Loan Facility due 2019 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 4,500
Number of borrowings permitted | borrowings |  |  |  |  |  | 7
Long-term Line of Credit |  | $ 1,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 3,500 |  |  |  |
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 1,300 |
Portion of outstanding borrowing amounts required as collateral |  |  |  |  | 105.00% |
Line of Credit Facility, amount pledged as collateral |  | 1,365 |  |  |  |
Short-term Debt |  | $ 1,300 |  |  |  |
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Debt Instrument, basis spread on variable rate |  | 0.75% |  |  |  |
Senior Note 2 Point 20 Percent Due 2020 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 1,250 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.20% |  |
Senior Note Floating Rate due 2020 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 750 |  |
Subsequent Event [Member] | Term Loan Facility due 2019 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Additional Draw - Term Loan Facility | $ 500 |  |  |  |  |
Scenario, Forecast [Member] | Term Loan Facility due 2019 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Line of Credit Facility, expiration period |  |  | 3 years |  |  |

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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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral). + 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=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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