Employment Benefit Plans Change in Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 30		$ 31
Pension and Other Postretirement Defined Benefit Plans, Liabilities	2		817
Pension Plan, Defined Benefit
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,014		1,817
Actual return on plan assets	625		302
Employer contributions	43	[1]	53	[1]
Benefits paid	(176)		(141)
Administration expenses	(1)		(1)
Settlements	(15)		(16)
Ending balance	2,490		2,014
Funded status (plan assets less projected benefit obligations)	270		(503)
Retiree Health and Welfare Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	0		0
Employer contributions	19	[2]	21	[2]
Plan participants' contributions	3		5
Benefits paid	(22)		(26)
Ending balance	0		0
Funded status (plan assets less projected benefit obligations)	$ (272)		$ (314)

[1] Other than contributions to the qualified pension plan, employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.

[2] Employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.