Segment Information - Net Sales Attributed to Foreign Countries (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 25,587	[1]	$ 17,092	[1]	$ 15,704	[1]	$ 16,070	[1]	$ 21,268	[1]	$ 13,806	[1]	$ 12,834	[1]	$ 13,185	[1]	$ 74,452	$ 61,093	$ 48,077
Foreign Country | Germany
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	10,535	8,732	7,230
Foreign Country | Japan
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	7,639	7,800	6,576
Foreign Country | United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	$ 7,291	$ 6,478	$ 5,348

[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.