New Accounting Pronouncements New Accounting Pronouncements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items]
Reduction in operating expenses	$ (750)	[1]	$ (768)	[1]
Income tax expense	149		125
Accounting Standards Update 2014-01 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Reduction in operating expenses	21		21
Income tax expense	$ 21		$ 21

[1] Expenses for the segments include fully apportioned corporate overhead expenses.