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Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Stock Repurchased During Period, Shares |  | 0 |
Issued |  | 1,069,000,000 | 1,070,000,000
In treasury |  | (196,000,000) | (204,000,000)
Total shares of common stock outstanding |  | 873,000,000 | 866,000,000
Defined benefit and other postretirement liability adjustments | [1] | $ (334,000,000) | $ (313,000,000)
Cumulative translation adjustment |  | (80,000,000) | (80,000,000)
Other |  | (55,000,000) | (61,000,000)
Total accumulated other comprehensive loss |  | (469,000,000) | (454,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Stock authorized to repurchase |  | $ 5,700,000,000 |
Number of shares of common stock repurchased from inception (in shares) |  | 201,000,000 |
Approximate value of shares of common stock repurchased from inception |  | $ 8,400,000,000 |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Number of shares of preferred stock that are authorized for issuance (in shares) |  | 5,000,000 |
Number of shares preferred stock that are issued at period end (in shares) |  | 0 |
Foreign Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Net actuarial losses |  | $ 295,000,000 | $ 290,000,000
[1] | Included net actuarial losses for our international pension plans of $295 million at December 31, 2017 and $290 million at December 31, 2016.

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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