Computation of EPS (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Computation of EPS
Net income available to common shareholders	$ 1,562	$ 1,916	$ 1,289
Weighted average number of common shares	703,042	698,739	696,532
Effect of dilutive outstanding equity-based awards	11,321	10,138	8,636
Weighted average number of diluted common shares	714,363	708,877	705,168
Basic EPS	$ 2.22	$ 2.74	$ 1.85
Diluted EPS	$ 2.19	$ 2.70	$ 1.83
Anti-dilutive awards	28,456	36,589	40,895