Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Overall expected long-term rate of return	6.53%
Defined Contribution Plan, Cost Recognized	$ 55,300,000	$ 50,800,000	$ 38,400,000
Treasury Stock, Shares, Acquired			461,151
Fixed-Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment strategy mix, securities	69.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment strategy mix, securities	31.00%
U S Large Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment strategy mix, securities	16.00%
U S Small Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment strategy mix, securities	3.00%
International
Defined Benefit Plan Disclosure [Line Items]
Investment strategy mix, securities	12.00%
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	(19,243,000)	0
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	44,961,000
Overall expected long-term rate of return	7.10%	7.65%	8.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	59,000,000
Impact on Projected Benefit Obligation [Member] | Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	28,300,000
Impact on Prior-Service Credit [Member] | Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	19,200,000
Impact on Actuarial Gain [Member] | Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	$ 9,100,000