Stock-based Compensation (Schedule of Share-based Goods and Nonemployee Services Transaction) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 186	$ 167	$ 332
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 2 months 15 days	5 years 1 month 27 days	5 years 2 months 23 days
Expected volatility	37.00%	39.00%	37.00%
Weighted average grant-date fair value per share	$ 12.33	$ 13.47	$ 19.26
Exercise of stock options [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 80	$ 23	$ 186
Employee Stock [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Shares available for future issuance through the plan	31
Expected volatility	36.00%	35.00%	23.00%
Expected dividend yield	1.87%	1.82%	1.07%
Risk-free interest rate	0.25%	0.01%	0.04%
Weighted average grant-date fair value per share	$ 8.61	$ 8.62	$ 11.80
Minimum \| Employee Stock Option [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Expected dividend yield	1.35%	1.51%	0.94%
Risk-free interest rate	1.13%	1.43%	1.57%
Maximum \| Employee Stock Option [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Expected dividend yield	2.46%	1.85%	1.77%
Risk-free interest rate	1.84%	1.72%	1.86%

Shares available for future issuance through the Employee Stock Purchase Plan.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: 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.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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