Pension and Other Employee Benefits Pension and Other Employee Benefits (Marketable securities held in trust) (Details) (Fair Value, Inputs, Level 1 [Member], Marketable Securities in Trust [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member] | Marketable Securities in Trust [Member]
Marketable Securities [Line Items]
Marketable securities held in trust	$ 479	$ 407