Employee Benefit Plans Employee Benefit Plans - Funded Status (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	$ 1,012	$ 931
Employer contributions	63	49
Participant contributions	0	0
Actual return on plan assets	213	120
Benefits paid	(117)	(88)
Plan assets at fair value, end of year	1,171	1,012	931
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	1,391	1,291
Service cost	6	7	10
Interest cost	54	61	63
Participant contributions	0	0
Actuarial (gain) loss	(104)	120
Benefits paid	(117)	(88)
Benefit obligation, end of year	1,230	1,391	1,291
Accumulated benefit obligation, end of year	1,229	1,390
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of plan	(59)	(379)
Other current liabilities	(4)	(4)
Other long-term liabilities	(55)	(375)
Amounts recognized on balance sheet	(59)	(379)
Other Postretirement [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	424	384
Employer contributions	8	9
Participant contributions	7	7
Actual return on plan assets	86	52
Benefits paid	(39)	(28)
Plan assets at fair value, end of year	486	424	384
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	632	575
Service cost	9	7	7
Interest cost	25	28	31
Participant contributions	7	7
Actuarial (gain) loss	(36)	43
Benefits paid	(39)	(28)
Benefit obligation, end of year	598	632	575
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of plan	(112)	(208)
Other current liabilities	0	0
Other long-term liabilities	(112)	(208)
Amounts recognized on balance sheet	(112)	(208)
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Life Insurance, Corporate or Bank Owned, Amount	$ 48	$ 44