Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans (Stock Option Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) $ / shares shares
Number of Options
Outstanding at December 31, 2015 \| shares	40
Granted \| shares	6
Exercised \| shares	(9)
Outstanding at December 31, 2016 \| shares	37
Vested and expected to vest at December 31, 2016 \| shares	37
Vested and exercisable at December 31, 2016 \| shares	23
Weighted-Average Exercise Price per Share
Outstanding at December 31, 2015	$ 19.82
Granted	30.05
Exercised	16.77
Forfeited	26.59
Expired	22.57
Outstanding at December 31, 2016	22.12
Vested and expected to vest at December 31, 2016	22.03
Vested and exercisable at December 31, 2016	$ 17.94
Weighted-Average Remaining Contractual Life (in years)
Outstanding at December 31, 2016	6 years 6 months
Vested and expected to vest at December 31, 2016	6 years 5 months 19 days
Vested and exercisable at December 31, 2016	5 years 2 months 16 days
Aggregate Intrinsic Value
Outstanding at December 31, 2016 \| $	$ 649
Vested and expected to vest at December 31, 2016 \| $	646
Vested and exercisable at December 31, 2016 \| $	$ 505

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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