v2.4.0.8

Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Plans
Shares authorized under the plan	36,000,000
Shares available for grant under the plan	7,900,000
Total unrecognized compensation costs related to all unvested share based awards	$ 93
Weighted average period over compensation costs are expected to be recognized	1 year 8 months 12 days
Additional share based compensation expense in connection with modification of share-based awards	22	4	3
Stock options
Share Based Compensation Plans
General term of awards after they are vested	10 years
Weighted-average grant-date fair value per share
Granted (in dollars per share)	$ 17.37	$ 18.87	$ 19.75
Option valuation assumptions
Dividend yield (as a percent)	2.00%		4.00%
Expected price volatility (as a percent)	39.00%	43.00%	40.00%
Risk free interest rate (as a percent)	0.94%	0.87%	1.97%
Expected life of options	5 years 3 months 18 days	5 years	4 years 10 months 24 days
Granted (in dollars per share)	$ 17.37	$ 18.87	$ 19.75
Stock appreciation rights
Share Based Compensation Plans
General term of awards after they are vested	10 years
Time-based awards
Share Based Compensation Plans
Vesting period	3 years
Time-based awards | Stock options
Stock option activity
Outstanding at the beginning of the period (in shares)	1,616,055
Granted (in shares)	455,915	395,673	194,342
Exercised (in shares)	(102,254)	(264,707)	(210,997)
Forfeited (in shares)	(102,973)
Expired (in shares)	(12,579)
Outstanding at the end of the period (in shares)	1,854,164	1,616,055
Vested and exercisable at the end of the period (in shares)	1,176,140
Total grant-date fair value of awards vested	7	5	8
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 71.69
Granted (in dollars per share)	$ 59.30
Exercised (in dollars per share)	$ 36.64
Forfeited (in dollars per share)	$ 56.97
Expired (in dollars per share)	$ 27.15
Outstanding at the end of the period (in dollars per share)	$ 71.49	$ 71.69
Vested and exercisable at the end of the period (in dollars per share)	$ 79.25
Weighted-average remaining contractual term
Outstanding	6 years 6 months 18 days	6 years 3 months 18 days
Vested and exercisable at the end of the period	5 years 3 months 25 days
Aggregate intrinsic value (in millions)
Exercised during the period	5	3	5
Additional disclosure
Aggregate intrinsic value	0	0
Unvested options outstanding (in shares)	678,024
Weighted-average grant-date fair value per share
Granted (in dollars per share)	$ 17.37	$ 18.87	$ 19.75
Option valuation assumptions
Granted (in dollars per share)	$ 17.37	$ 18.87	$ 19.75
Time-based awards | Restricted shares
Equity instruments other than options activity
Vested (in shares)	0	0	(3,939)
Additional disclosure
Total grant date fair value			1
Time-based awards | Deferred units
Equity instruments other than options activity
Outstanding at the beginning of the period (in shares)	2,870,051
Granted (in shares)	1,691,029	2,183,853	1,090,747
Vested (in shares)	(1,556,840)	1,064,359	832,252
Forfeited (in shares)	(271,912)
Outstanding at the end of the period (in shares)	2,732,328	2,870,051
Weighted-average grant-date fair value per share
Outstanding at the beginning of the period (in dollars per share)	$ 58.09
Granted (in dollars per share)	$ 58.91	$ 50.07	$ 77.55
Vested (in dollars per share)	$ 61.32
Forfeited (in dollars per share)	$ 57.28
Outstanding at the end of the period (in dollars per share)	$ 56.84	$ 58.09
Additional disclosure
Total grant date fair value	95	74	66
Time-based awards | Stock appreciation rights
Additional disclosure
Aggregate intrinsic value	0	0
Unvested options outstanding (in shares)	0
Equity instruments other than options activity
Outstanding at the beginning of the period (in shares)	187,739
Outstanding at the end of the period (in shares)	187,739	187,739
Vested and exercisable at the end of the period (in shares)	187,739
Weighted average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 93.39	$ 93.39
Outstanding at the end of the period (in dollars per share)	$ 93.39	$ 93.39
Vested and exercisable at the end of the period (in dollars per share)	$ 93.39
Weighted-average remaining contractual term
Outstanding	2 years 9 months 4 days	3 years 9 months 4 days
Vested and exercisable, at the end of the period	2 years 9 months 4 days
Additional disclosure
Exercises (in shares)	0	0	1,400
Total pre-tax intrinsic value of stock appreciation rights exercised			0
Performance-based awards
Share Based Compensation Plans
Number of equal installments vesting	1
Performance-based awards | Stock options
Stock option activity
Outstanding at the beginning of the period (in shares)	179,262
Exercised (in shares)	(7,385)
Outstanding at the end of the period (in shares)	171,877	179,262
Vested and exercisable at the end of the period (in shares)	171,877
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 75.30
Exercised (in dollars per share)	$ 22.58
Outstanding at the end of the period (in dollars per share)	$ 77.57	$ 75.30
Vested and exercisable at the end of the period (in dollars per share)	$ 77.57
Weighted-average remaining contractual term
Outstanding	2 years 3 months 11 days	3 years 2 months 19 days
Vested and exercisable at the end of the period	2 years 3 months 11 days
Aggregate intrinsic value (in millions)
Exercised during the period	0
Additional disclosure
Aggregate intrinsic value	0	0
Unvested options outstanding (in shares)	0
Two-year Awards
Share Based Compensation Plans
Measurement period	2 years
Three-year Awards
Share Based Compensation Plans
Measurement period	3 years
Market-based awards
Share Based Compensation Plans
Number of equal installments vesting	1
Market-based awards | Deferred units
Equity instruments other than options activity
Outstanding at the beginning of the period (in shares)	231,451
Granted (in shares)	171,001	163,319	98,797
Vested (in shares)	(78,136)		0
Forfeited (in shares)	(18,153)
Outstanding at the end of the period (in shares)	306,163	231,451
Weighted-average grant-date fair value per share
Outstanding at the beginning of the period (in dollars per share)	$ 65.50
Granted (in dollars per share)	$ 74.05	$ 58.52	$ 78.69
Vested (in dollars per share)	$ 78.69
Forfeited (in dollars per share)	$ 69.87
Outstanding at the end of the period (in dollars per share)	$ 66.65	$ 65.50
Additional disclosure
Total grant date fair value	$ 6	$ 24

X

- Definition

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The weighted average period between the balance-sheet date and expiration for all vested portions of equity instruments other than options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average exercise price of awards on share-based plans excluding option plans (for example, phantom stock plan, stock 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.

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

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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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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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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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.

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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 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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