Certain Employee Benefit and Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Certain Employee Benefit and Stock-Based Compensation Plans
Total compensation expense recognized related to all share-based payment arrangements	$ 53	$ 48
Maximum life of options (in years)	10
Treasury stock	146,462
Vesting period for restricted stock/unit awards, lower range	36
Vesting period for restricted stock/unit awards, upper range	60
Unrecognized deferred compensation expense related to nonvested share-based compensation arrangements	$ 77
Cash-payable restricted share units outstanding	764,091

Cash Payable Restricted Share Units Associate With Annual Bonus Incentive Deferred Plan Total Shares Outstanding At End Of Period

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- Definition

Certain Employee Benefit And Stock-Based Compensation Plans [Abstract]

+ Details

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- Definition

Maximum life of options.

+ Details

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- Definition

Number of shares of treasury stock acquired reissued.

+ Details

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- Definition

lower range of vesting period for restricted stock/unit awards

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- Definition

upper range of vesting period for restricted stock/unit awards

+ Details

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- Definition

As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, 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 Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

+ Details

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