Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2014 Subsequent Event [Member]
Effective income tax rate	33.90%	23.10%
Tax Adjustments, Settlements, and Unusual Provisions		$ 145	$ 115
Unrecognized tax benefits that could affect earnings within next 12 months	$ 130