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Long-Term Debt (6.250% Senior Notes Due 2021) (Details) - Senior Notes [Member] - USD ($)		Mar. 31, 2018	Jan. 23, 2018	Dec. 31, 2017	Apr. 07, 2016
Debt Instrument [Line Items]
Face amount			$ 2,200,000,000.0
Six Point Two Five Zero Percentage Senior Notes Due Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Senior Notes	[1]	$ 0		$ 800,000,000
Face amount					$ 800,000,000
Senior Notes Call Premium			$ 32,000,000
Interest rate, stated percentage					6.25%
[1] (2)The Senior Notes were redeemed on January 23, 2018.

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Senior Notes Call Premium

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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

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-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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