Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Note [Abstract]
Beginning balance, Shares Issued	2,805,961,317	2,805,961,317	2,805,961,317
Beginning balance, Shares Repurchased	(761,542,032)	(717,221,651)	(729,932,673)
Beginning balance, Shares Outstanding	2,044,419,285	2,088,739,666	2,076,028,644
Exercise of stock options and issuance of other stock awards, Shares Repurchased	181,011	5,004,502	12,711,022
Exercise of stock options and issuance of other stock awards, Shares Outstanding	181,011	5,004,502	12,711,022
Repurchases of common stock, Shares Repurchased	(34,860,000)	(49,324,883)
Repurchases of common stock, Shares Outstanding	(34,860,000)	(49,324,883)
Ending balance, Shares Issued	2,805,961,317	2,805,961,317	2,805,961,317
Ending balance, Shares Repurchased	(796,221,021)	(761,542,032)	(717,221,651)
Ending balance, Shares Outstanding	2,009,740,296	2,044,419,285	2,088,739,666