Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of equity awards common stock	26,000,000
Shares available for future awards	17,000,000
Excess tax benefits	$ 1	$ 1
Stock options vested during period	1,000,000
Total Fair Value of stock options vested	3	5	7
Unrecognized compensation cost related to stock options expected to be recognized	1
Weighted average period for recognizing unrecognized compensation cost	6 months
Compensation expense	1	1	1
Percentage of fair market value being expected purchase price of employee stock purchase plan	95.00%
Maximum percentage limit of base pay for employees for purchasing shares	10.00%
Shares issued under employee stock purchase plan	191,572	183,338	178,684
Shares issued under employee purchase plan, Average price per share	$ 31.32	$ 30.69	$ 30.32
Shares available for future issuance under Employee Stock Purchase Plan	3,600,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	4 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of restricted stock units vested	1	1	3
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of granted shares	$ 30.95	$ 32.03	$ 31.13
Unrecognized compensation cost related to stock options expected to be recognized	9
Weighted average period for recognizing unrecognized compensation cost	1 year
Total intrinsic value of restricted stock units vested	5	7	6
Dividend equivalents accrued on stock units	40,044
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower payout percentage based on initial grant	0.00%
Upper payout percentage based on initial grant	200.00%
Weighted average grant date fair value of granted shares	$ 31.25	$ 35.33	$ 34.29
Total intrinsic value of performance units vested	4	9	15
Unrecognized compensation cost related to stock options expected to be recognized	$ 13
Weighted average period for recognizing unrecognized compensation cost	1 year
Dividend equivalents accrued on stock units	49,170
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower payout percentage based on initial grant	0.00%
Upper payout percentage based on initial grant	200.00%
Current accrual percentage based on original grant	100.00%
Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	1 year
Minimum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	3 years
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	10 years
Maximum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	4 years

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