Employee Benefit Plans - Plan Amendments and Assets (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined benefit plan global plan assets at measurement dates	$ 9.2	$ 8.7

Defined Benefit Plan, Fair Value of Plan Assets, Global Plan Assets

No definition available.

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Balance Type:	debit
Period Type:	instant