Long-Term Debt Long-Term Debt (Narratives) (Details) - USD ($)	6 Months Ended
Jun. 30, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Contributions to company's qualified defined benefit pension plans	$ 3,200,000,000
Value of common stock from treasury contributed to qualified defined benefit pension plans	$ 350,000,000
Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,000,000,000.0
Unsecured Debt \| 2.875% Notes due 2020
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000,000,000.0
Debt instrument, stated interest rate (percent)		2.875%
Unsecured Debt \| 3.625% Notes due 2022
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000,000,000.0
Debt instrument, stated interest rate (percent)		3.625%

Treasury Stock Contributed to Qualified Defined Benefit Pension Plan, Amount

No definition available.

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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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-Name Accounting Standards Codification
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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- Definition

Amount of contributions made by the employer to defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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