Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) (USD $)	1 Months Ended	12 Months Ended
	Aug. 31, 2013	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Jul. 18, 2013
Class of Stock [Line Items]
Stock Repurchase Program, Authorization Amount Increase							$ 4,300,000,000
Issued		1,072,000,000		1,073,000,000
In treasury		(223,000,000)		(144,000,000)
Total shares of common stock outstanding		849,000,000		929,000,000
Defined benefit and other postretirement liability adjustments		(241,000,000)	[1]	(241,000,000)	[1]
Cumulative translation adjustment		(69,000,000)		(69,000,000)
Other		3,000,000		1,000,000
Total accumulated other comprehensive loss		(307,000,000)		(309,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock authorized to repurchase		5,000,000,000
Treasury Stock, Value, Acquired, Cost Method	(3,300,000,000)	(4,356,000,000)
Treasury Stock Acquired, Average Cost Per Share	$ 48.50	$ 47.02
Stock remaining available for repurchase at period end		1,700,000,000
Number of shares of common stock repurchased from inception (in shares)		188,000,000
Approximate value of shares of common stock repurchased from inception		7,600,000,000
Average price per share of common stock that has been repurchased from inception (in dollars per share)		$ 40.52
Repurchase of shares during the period (in shares)	68,000,000	93,000,000
Common Stock, Dividends, Per Share, Declared		$ 0.525		$ 0.36		$ 0.36
Payments of Ordinary Dividends, Common Stock		465,000,000		333,000,000		330,000,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Number of shares of preferred stock that are authorized for issuance (in shares)		5,000,000
Number of shares preferred stock that are issued at period end (in shares)		0
Foreign Pension Plans, Defined Benefit
Class of Stock [Line Items]
Net actuarial losses		$ 222,000,000		$ 208,000,000

[1] Included net actuarial losses for our international pension plans of $222 million at December 31, 2013 and $208 million at December 31, 2012.Amounts reclassified out of accumulated other comprehensive loss and the tax effects allocated to each component of other comprehensive income were not material for the year ended December 31, 2013 or 2012.