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Consolidated Statements of Changes in Stockholders' Equity Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stocks | Additional Paid-in Capital | Retained Earnings | Treasury Stock, at Cost | AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | ---
Additional Paid in Capital |  |  | $ 9,894 |  |  |
Treasury Stock, Value |  |  |  |  | $ (1,598) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (79) |  |  |  |  | $ (79)
Common Stock, Shares, Outstanding |  | 453,290 |  |  |  |
Treasury Stock, Shares, Acquired |  | 49,518 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | 801 |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  | 0 |  | 0 |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 2,003 |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited |  | 439 |  |  |  |
Dividends, Common Stock, Cash |  |  |  | $ 290 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (64) |  |  |
Balance at beginning of period at Dec. 31, 2013 |  |  |  | 10,683 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Allocated Share-based Compensation Expense | 98 |  |  |  |  |
Net Income (Loss) Attributable to Parent | 798 |  |  | 798 |  |
Treasury stock acquired |  |  |  |  | 1,796 |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  | 82 |
Return of shares under incentive and stock compensation plans to treasury stock | (30) |  |  |  | (16) |
Total other comprehensive income | 1,007 |  |  |  |  | 1,007
Balance at end of period at Dec. 31, 2014 | 18,720 |  |  | 11,191 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs | 801 |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  | 19,080 |  |  |  |
Common Stock, Value, Issued |  | $ 5 |  |  |  |
Additional Paid in Capital |  |  | 9,123 |  |  |
Treasury Stock, Value |  |  |  |  | (2,527) |
Retained Earnings (Accumulated Deficit) |  |  |  | 11,191 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 928 |  |  |  |  | 928
Common Stock, Shares, Outstanding |  | 424,416 |  |  |  |
Treasury Stock, Shares, Acquired |  | 28,431 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 90 |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  | 0 |  | 0 |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 4,877 |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited |  | 1,311 |  |  |  |
Dividends, Common Stock, Cash |  |  |  | 323 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (165) |  |  |
Allocated Share-based Compensation Expense | 78 |  | 78 |  |  |
Net Income (Loss) Attributable to Parent | 1,682 |  |  | 1,682 |  |
Treasury stock acquired |  |  |  |  | 1,250 |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  | 184 |
Return of shares under incentive and stock compensation plans to treasury stock | (42) |  |  |  | (54) |
Total other comprehensive income | (1,257) |  |  |  |  | (1,257)
Balance at end of period at Dec. 31, 2015 | 17,642 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 90 |
Stock Issued During Period, Shares, Conversion of Units |  | 2,270 |  |  |  |
Common Stock, Value, Issued | 5 | $ 5 |  |  |  |
Additional Paid in Capital | 8,973 |  | 8,973 |  |  |
Treasury Stock, Value | (3,557) |  |  |  | (3,557) |
Retained Earnings (Accumulated Deficit) | 12,550 |  |  | 12,550 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (329) |  |  |  |  | (329)
Common Stock, Shares, Outstanding |  | 401,821 |  |  |  |
Treasury Stock, Shares, Acquired |  | 30,782 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 16 |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  | (3,646) |  | 3,647 |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 3,766 |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited |  | 1,243 |  |  |  |
Dividends, Common Stock, Cash |  |  |  | 332 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (143) |  |  |
Allocated Share-based Compensation Expense | 81 |  | 74 |  |  |
Net Income (Loss) Attributable to Parent | 896 |  |  | 896 |  |
Treasury stock acquired |  |  |  |  | 1,330 |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  | 153 |
Return of shares under incentive and stock compensation plans to treasury stock | (9) |  |  |  | (54) |
Total other comprehensive income | (8) |  |  |  |  | (8)
Balance at end of period at Dec. 31, 2016 | 16,903 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 16 |
Stock Issued During Period, Shares, Conversion of Units |  | 387 |  |  |  |
Common Stock, Value, Issued | 4 | $ 4 |  |  |  |
Additional Paid in Capital | 5,247 |  | $ 5,247 |  |  |
Treasury Stock, Value | (1,125) |  |  |  | $ (1,125) |
Retained Earnings (Accumulated Deficit) | 13,114 |  |  | $ 13,114 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (337) |  |  |  |  | $ (337)
Common Stock, Shares, Outstanding |  | 373,949 |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + 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(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + 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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