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Shareholders' Equity Repurchase Activity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jul. 26, 2013	Jul. 18, 2013
Repurchase Activity [Abstract]
Stock Repurchased During Period, Shares		25
Treasury Stock Acquired, Average Cost Per Share		$ 42.67
Stock Repurchase Program, Authorization Amount Increase				$ 4,300,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	5,000,000,000
Tender Offer Amount			$ 3,300,000,000
Tender Offer, Minimum Price per Share			$ 42.50
Tender Offer, Maximum Price per Share			$ 48.50

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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