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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 64 | $ 58 | $ 58
Tax benefit recognized on stock-based compensation expense | 22 | 20 | 20
Tax benefit realized for tax deductions resulting from exercises and vestings | 66 | 45 | 35
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow | 47 | 27 | 23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward |  |  |
Stock options outstanding as of beginning of year | 13,214,728 |  |
Number of stock options, granted | 201,300 |  |
Number of stock options, exercised | (3,837,090) |  |
Number of stock options, expired | (1,780,113) |  |
Options granted on conversion related to separation of retail business | 759,268 |  |
Stock options outstanding as of end of year | 8,558,093 | 13,214,728 |
Number of stock options, exercisable as of December 31, 2013 | 8,037,807 |  |
Weighted-average exercise price per share outstanding, beginning balance | $ 28.54 |  |
Weighted-average exercise price per share, granted | $ 39.67 |  |
Weighted-average exercise price per share, exercised | $ 15.21 |  |
Weighted-average exercise price per share, expired | $ 49.45 |  |
Weighted-average exercise price per share, options granted on conversion related to separation of retail business | $ 28.84 |  |
Weighted-average exercise price per share outstanding, ending balance | $ 27.88 | $ 28.54 |
Weighted-average exercise price per share, exercisable as of December 31, 2013 | $ 27.66 |  |
Weighted-average remaining contractual term, outstanding as of December 31, 2013 | 3 years 5 months 25 days |  |
Weighted-average remaining contractual term, exercisable as of December 31, 2013 | 3 years 1 month 14 days |  |
Aggregate intrinsic value, outstanding as of December 31, 2013 | 216 |  |
Aggregate intrinsic value, exercisable as of December 31, 2013 | 206 |  |
Employee Stock Option [Member] |  |  |
Summary of Weighted-Average Assumptions Used in Fair Value Measurements |  |  |
Expected life in years | 6 years | 6 years | 6 years
Expected volatility | 49.63% | 49.11% | 49.30%
Expected dividend yield | 2.27% | 2.39% | 2.28%
Risk-free interest rate | 1.77% | 0.85% | 1.44%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward |  |  |
Weighted average grant date fair value of stock option | $ 15.83 | $ 10.98 | $ 10.10
Intrinsic value of stock options exercised | 101 | 78 | 63
Cash received from exercise of stock options | 59 | 59 | 49
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 3 years |  |
Unrecognized share-based compensation cost related to outstanding unvested awards | 1 |  |
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards | 2 years |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Stock option award expiration period | 7 years |  |
Employee Stock Option [Member] | Maximum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Stock option award expiration period | 10 years |  |
Restricted Stock Awards - Nonemployee [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 3 years |  |
Restricted Stock [Member] |  |  |
Nonvested Shares or Awards Other Than Options Rollforward |  |  |
Nonvested shares or awards, beginning balance | 2,920,288 |  |
Shares or awards, granted | 1,255,742 |  |
Awards, vested | (2,113,647) |  |
Shares or awards, forfeited | (31,546) |  |
Shares granted on conversion related to separation of retail business | 174,477 |  |
Nonvested shares or awards, ending balance | 2,205,314 | 2,920,288 |
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward |  |  |
Weighted average grant date fair value, beginning balance | $ 24.76 |  |
Weighted average grant date fair value, granted | $ 39.55 |  |
Weighted average grant date fair value, vested | $ 23.73 |  |
Weighted average grant date fair value, forfeited | $ 23.73 |  |
Weighted-average grant date fair value, shares granted on conversion related to separation of retail business | $ 23.42 |  |
Weighted average grant date fair value, ending balance | $ 32.23 | $ 24.76 |
Stock Based Compensation (Textual) |  |  |
Unrecognized share-based compensation cost related to outstanding unvested awards | 40 |  |
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards | 2 years |  |
Total fair value of restricted stock vested | 74 | 47 | 32
Restricted Stock [Member] | Minimum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 3 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 5 years |  |
Performance Awards [Member] |  |  |
Nonvested Shares or Awards Other Than Options Rollforward |  |  |
Nonvested shares or awards, beginning balance | 989,414 |  |
Shares or awards, granted | 415,317 |  |
Awards, vested | (442,274) |  |
Shares or awards, forfeited | (50,076) |  |
Shares granted on conversion related to separation of retail business | 34,784 |  |
Nonvested shares or awards, ending balance | 947,165 | 989,414 |
Vested Awards Other Than Options Rollforward |  |  |
Vested awards, beginning balance | 208,916 |  |
Awards, vested | 442,274 |  |
Awards, converted | (534,515) |  |
Awards, forfeited | 116,675 |  |
Vested awards, ending balance | 0 | 208,916 |
Performance Awards Converted [Abstract] |  |  |
Vested awards converted | 651,190 |  |
Converted shares issued | 534,515 |  |
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 1 year |  |
Unrecognized share-based compensation cost related to outstanding unvested awards | 16 |  |
Total fair value of restricted stock vested | $ 12 | $ 3 | $ 4
Performance award vesting rights | 33.33% |  |
Number of vesting tranches under performance awards granted | 3 |  |
Performance Awards [Member] | Award Year 2010 [Member] |  |  |
Vested Awards Other Than Options Rollforward |  |  |
Awards, forfeited | 0 |  |
Performance Awards Converted [Abstract] |  |  |
Vested awards converted | 417,833 |  |
Actual conversion rate of common shares | 100.00% |  |
Converted shares issued | 417,833 |  |
Performance Awards [Member] | Award Year 2011 [Member] |  |  |
Vested Awards Other Than Options Rollforward |  |  |
Awards, forfeited | 116,675 |  |
Performance Awards Converted [Abstract] |  |  |
Vested awards converted | 233,357 |  |
Actual conversion rate of common shares | 50.00% |  |
Converted shares issued | 116,682 |  |
Performance Awards [Member] | Vesting Tranche - Three [Member] | Award Year 2011 [Member] |  |  |
Nonvested Shares or Awards Other Than Options Rollforward |  |  |
Shares or awards, granted | 227,565 |  |
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward |  |  |
Weighted average grant date fair value, granted | $ 38.77 |  |
Expected conversion rate of common stock shares | 1.00 |  |
Performance Awards [Member] | Vesting Tranche - Two [Member] | Award Year 2012 [Member] |  |  |
Nonvested Shares or Awards Other Than Options Rollforward |  |  |
Shares or awards, granted | 105,030 |  |
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward |  |  |
Weighted average grant date fair value, granted | $ 38.77 |  |
Expected conversion rate of common stock shares | 1.00 |  |
Performance Awards [Member] | Vesting Tranche - One [Member] | Award Year 2013 [Member] |  |  |
Nonvested Shares or Awards Other Than Options Rollforward |  |  |
Shares or awards, granted | 82,722 |  |
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward |  |  |
Weighted average grant date fair value, granted | $ 38.77 |  |
Expected conversion rate of common stock shares | 1.00 |  |
Performance Awards [Member] | Minimum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Performance awards range of conversion rates | 0.00% |  |
Performance Awards [Member] | Maximum [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Performance awards range of conversion rates | 200.00% |  |
Omnibus Stock Incentive Plan [Member] | Stock Compensation Plan [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Number of shares of common stock available to be awarded under stock-based compensation plans | 15,340,981 |  |
Formerly Maintained Plans [Member] | Stock Compensation Plan [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Number of shares of common stock available to be awarded under stock-based compensation plans | 0 |  |

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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. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -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 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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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. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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 (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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