Profit Per Share (Details) (USD $)	1 Months Ended		3 Months Ended
	Jan. 31, 2014	Feb. 28, 2007	Mar. 31, 2014		Mar. 31, 2013
Earnings Per Share [Abstract]
Profit for the period (A) (in dollars)			$ 922,000,000	[1]	$ 880,000,000	[1]
Weighted-average common shares outstanding:
Weighted-average number of common shares outstanding (B) (in shares)			626,700,000		656,200,000
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price (in shares)			12,600,000		15,400,000
Average common shares outstanding for fully diluted computation (C) (in shares)			639,300,000	[2]	671,600,000	[2]
Profit (loss) per share of common stock:
Assuming no dilution (A/B) (in dollars per share)			$ 1.47		$ 1.34
Assuming full dilution (A/C) (in dollars per share)			$ 1.44	[2]	$ 1.31	[2]
Shares outstanding as of March 31			624,200,000		657,500,000
Common shares under SARs and stock options not included in the computation of diluted earnings per share (in shares)			10,415,733		10,312,876
Common stock repurchase
Stock Repurchase Program, Authorized Amount	10,000,000,000	7,500,000,000
Common shares repurchased (in shares)			18,110,735		0
Payments for repurchase of common stock			$ 1,738,000,000		$ 0

[1] 1 Profit attributable to common stockholders.

[2] 2 Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.