Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($) Offering_Period $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares
Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost \| $	$ 294	$ 298	$ 264
Tax benefit \| $	(99)	(90)	(81)
Stock-based compensation cost, net of tax \| $	$ 195	$ 208	183
Number of shares reserved for issuance to recipient (in shares)	187.0
Number of shares available for future grant (in shares)	19.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration from date of award (in years)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period	17.4
Granted	4.3
Exercised	(0.8)
Forfeited/expired	(0.9)
Outstanding at end of period	20.0	17.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding- weighted average exercise price at beginning of period (in dollars per share) \| $ / shares	$ 43.73
Granted \| $ / shares	43.49
Exercised \| $ / shares	30.81
Forfeited/expired \| $ / shares	49.88
Outstanding- weighted average price per share end of period (in dollars per share) \| $ / shares	$ 43.90	$ 43.73
Weighted Average Remaining Contractual Term (years)	7 years 37 days
Aggregate Intrinsic Value \| $	$ 20
Number of shares exercisable at the end of the period	11.2
Weighted Average Exercise Price per Share, Exercisable at the end of the period \| $ / shares	$ 39.95
Weighted Average Remaining Contractual Term (years), Exercisable at the end of the period	5 years 292 days
Aggregate Intrinsic Value, Exercisable at the end of the Period \| $	$ 20
Intrinsic value of stock options exercised during the period \| $	9	$ 151	93
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Unrecognized compensation cost, non vested awards at period end \| $	$ 88
Weighted average period unrecognized compensation costs to be recognized (in years)	2 years
Cash received from option exercises \| $	$ 167	$ 332	$ 277
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	5 years 58 days	5 years 84 days	5 years 99 days
Expected volatility	39.00%	37.00%	40.00%
Weighted average grant-date fair value per share \| $ / shares	$ 13.47	$ 19.26	$ 14.34
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	1.51%	0.94%	0.94%
Risk-free interest rate	1.43%	1.57%	0.77%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	1.85%	1.77%	1.33%
Risk-free interest rate	1.72%	1.86%	1.73%
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares at the beginning of the period	16.1
Granted	6.5
Vested	(4.8)
Forfeited	(1.3)
Non vested shares at the end of the period	16.5	16.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant-Date Fair Value per Share, Non vested shares at the beginning of the period \| $ / shares	$ 45.88
Granted \| $ / shares	43.24
Vested \| $ / shares	42.86
Forfeited \| $ / shares	47.57
Weighted Average Grant-Date Fair Value Per Share, Nonvested shares at the end of the period \| $ / shares	$ 45.59	$ 45.88
Total fair value of shares vested during the period \| $	$ 211
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance to recipient (in shares)	74.0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	35.00%	23.00%	27.00%
Expected dividend yield	1.82%	1.07%	1.12%
Risk-free interest rate	0.01%	0.04%	0.06%
Weighted average grant-date fair value per share \| $ / shares	$ 8.62	$ 11.80	$ 8.40
Employee Stock Purchase Plan [Abstract]
Percentage of earnings eligible employees may have withheld under the employee stock purchase plan	10.00%
Number of offering periods \| Offering_Period	4
Number of months each offering period lasts beginning January 1 and July 1 each year (in months)	3 months
Percentage of the lower of fair market value of the unit on the commencement date or the fair market value of unit on the last trading day of the offering period	85.00%
Number of shares sold through the plan (in shares)	40.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration from date of award (in years)	10 years
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Unrecognized compensation cost, non vested awards at period end \| $	$ 507
Weighted average period unrecognized compensation costs to be recognized (in years)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Granted \| $ / shares		$ 58.21	$ 42.93
Total fair value of shares vested during the period \| $		$ 278	$ 208

The cumulative number of shares sold through the plan as of the balance sheet date.

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This element represents the number of months that each offering period lasts beginning on January 1 and July 1 of each fiscal year.

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Reflects the dating as to when the share-based award expires in relation to the grant date, as specified in the award agreement.

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Share-based Compensation Arrangement By Share Based Payment Award Number Of Offering Periods

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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.

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The amount of expense, net of income tax, 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.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on offering date that participants pay for shares.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- References

No definition available.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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