Defined Benefit Pension And Other Postretirement Plans (Components Of Net Periodic Benefit Cost And Other Comprehensive Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (pretax):
Amortization of actuarial loss	$ (69)	[1]
Amortization of prior service cost (credit)	49	[1]
Pension Benefits [Member]
Components of net periodic benefit cost:
Service cost	93		66		65
Interest cost	73		94		110
Expected return on plan assets	(107)		(104)		(97)
Amortization - prior service cost (credit)	(45)		(18)		6
Amortization - actuarial loss	66		93		71
Amortization - net settlement/curtailment loss	95	[2]	125	[2]	8	[2]
Net periodic benefit cost	175	[3]	256	[3]	163	[3]
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (pretax):
Actuarial (gain) loss	(317)		46		427
Prior service cost (credit)	0	[4]	(520)	[4]	0	[4]
Amortization of actuarial loss	(161)		(218)		(79)
Amortization of prior service cost (credit)	45		18		(6)
Other	0	[5]	0	[5]	6	[5]
Total recognized in other comprehensive loss	(433)		(674)		348
Total recognized in net periodic benefit cost and other comprehensive loss	(258)		(418)		511
Other Benefits [Member]
Components of net periodic benefit cost:
Service cost	25		20		19
Interest cost	26		24		27
Expected return on plan assets	0		0		0
Amortization - prior service cost (credit)	(4)		(2)		0
Amortization - actuarial loss	3		2		0
Amortization - net settlement/curtailment loss	0	[2]	0	[2]	0	[2]
Net periodic benefit cost	50	[3]	44	[3]	46	[3]
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (pretax):
Actuarial (gain) loss	17		53		39
Prior service cost (credit)	4	[4]	(40)	[4]	0	[4]
Amortization of actuarial loss	(3)		(2)		0
Amortization of prior service cost (credit)	4		2		0
Other	0	[5]	0	[5]	0	[5]
Total recognized in other comprehensive loss	22		13		39
Total recognized in net periodic benefit cost and other comprehensive loss	$ 72		$ 57		$ 85

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.

[2] A curtailment gain was recorded in 2011 on the Speedway pension plan at the end of the transition services period related to the sale of most of our Minnesota Assets in 2010. See Note 6.

[3] Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.

[4] Includes adjustments due to plan amendments approved in 2013 and adjustments due to changes made to the defined pension plans and the post-65 medical plan coverage effective January 1, 2013.

[5] Includes adjustments related to the Spinoff in 2011.