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Debt Level 4 (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 15, 2018 | Dec. 31, 2017
Debt Instruments [Line Items] |  |  |
Available-for-sale Securities, Equity Securities | $ 0 |  | $ 1,012,000,000
Long-term Debt, Gross |  | $ 500,000,000 |
Proceeds from Debt, Net of Issuance Costs | $ 490,000,000 |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 100.00% |  |
Debt Instrument, Interest Rate, Increase (Decrease) | 2500.00% |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000 |  |
Line of Credit Facility, Interest Rate at Period End | 0.50% |  |
Line of Credit Facility, Covenant Terms | 9 |  |
Letters of Credit Outstanding, Amount | $ 3 |  |
Line of Credit Facility, Increase (Decrease) for Period, Description | 100 |  |
Scenario, Previously Reported [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Line of Credit Facility, Covenant Terms | 13.5 |  |
Revolving Credit Facility [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Term | 5 years |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 750,000,000 |  |
Line of Credit Facility, Covenant Terms | 0.35 |  |
Line of Credit Facility, Maximum Amount Outstanding During Period | $ 0 |  |
Revolving Credit Facility [Member] | Scenario, Previously Reported [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000,000,000 |  |
Senior Note Six Point Three Due in Two Thousand Eighteen [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.30% |
Senior Note Four Point Four Due in Two Thousand Forty Seven [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.40% |
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member] | Senior Notes |  |  |
Debt Instruments [Line Items] |  |  |
Repayment of debt |  | $ 320,000,000 |

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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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