Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended		12 Months Ended									0 Months Ended	3 Months Ended	12 Months Ended			12 Months Ended		9 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended		1 Months Ended	9 Months Ended	12 Months Ended		12 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011 Predecessor	Dec. 31, 2011 Pension Plan	Dec. 31, 2012 Pension Plan item	Mar. 31, 2011 Pension Plan	Dec. 31, 2012 Pension Plan Interest rate sensitive investments	Dec. 31, 2012 Pension Plan Investment grade bonds	Dec. 31, 2012 Pension Plan High yield and emerging market bonds and convertible bonds	Dec. 31, 2012 Pension Plan Diversified strategies	Dec. 31, 2012 Pension Plan Investments designed to provide higher expected returns than interest rate sensitive investments	Dec. 31, 2012 Pension Plan U.S. stocks	Dec. 31, 2012 Pension Plan Developed market Non-U.S. stocks	Dec. 31, 2012 Pension Plan Other	Dec. 31, 2012 Pension Plan Real estate	Jan. 02, 2011 Pension Plan Predecessor	Mar. 31, 2011 Pension Plan Predecessor	Dec. 31, 2010 Pension Plan Predecessor	Dec. 31, 2012 Pension Plan ABF Union-represented employees	Dec. 31, 2012 Pension Plan ABF Non-represented employees	Dec. 31, 2012 Pension Plan ABF Non-represented employees Maximum	Dec. 31, 2012 Pension Plan OMF and DLS Non-represented employees Minimum	Dec. 31, 2011 Non-Qualified Pension	Dec. 31, 2012 Non-Qualified Pension	Mar. 31, 2011 Non-Qualified Pension	Jan. 02, 2011 Non-Qualified Pension Predecessor	Dec. 31, 2010 Non-Qualified Pension Predecessor	Mar. 31, 2011 Non-Qualified Pension Predecessor	Oct. 31, 2012 Post-Retirement Benefit Plan	Dec. 31, 2011 Post-Retirement Benefit Plan	Dec. 31, 2012 Post-Retirement Benefit Plan	Mar. 31, 2011 Post-Retirement Benefit Plan	Dec. 31, 2012 Post-Retirement Benefit Plan Equity investments	Dec. 31, 2012 Post-Retirement Benefit Plan Non-equity investments	Jan. 02, 2011 Post-Retirement Benefit Plan Predecessor	Mar. 31, 2011 Post-Retirement Benefit Plan Predecessor	Dec. 31, 2010 Post-Retirement Benefit Plan Predecessor	Dec. 31, 2011 Post-Retirement Benefit Plan Minimum	Dec. 31, 2012 Post-Retirement Benefit Plan Minimum	Dec. 31, 2011 Post-Retirement Benefit Plan Maximum	Dec. 31, 2012 Post-Retirement Benefit Plan Maximum	Dec. 31, 2012 Post-Retirement Benefit Plan Union-represented employees
Employee Benefits
Number of formulas under the plan to provide benefits to participants					5
Compensation credit as percentage of eligible compensation																			3.00%	3.00%
Period of service completed by December 31, 2000																					20 years	20 years
Amortization period of the plan shortfall					7 years
Unfunded status				$ (627)	$ (948)																		$ (23)	$ (22)						$ (2,706)	$ (2,866)
Collective bargaining agreements, term																													4 years
Number of employees covered under the plan (as a percent)																																										100.00%
Effect of change of 100 basis points in the assumed initial health care cost trend rate
Effect on the aggregate of the service and interest cost components of net periodic post-retirement benefit expense (statements of operations) - Increase																															3
Effect on the aggregate of the service and interest cost components of net periodic post-retirement benefit expense (statements of operations) - Decrease																															(3)
Effect on benefit obligation (balance sheets) - Increase																															74
Effect on benefit obligation (balance sheets) - Decrease																															(66)
Healthcare cost increase trend rates (as a percent)
Annual decrease in health care cost trend rate (as a percent)																															0.25%
Health care cost trend rate (as a percent)																															6.75%
Ultimate health care cost trend rate (as a percent)																														5.00%	5.00%						5.00%
Estimated future projected benefit payments
2013					753																			2							335
2014					701																			2							329
2015					684																			2							321
2016					666																			2							311
2017					648																			2							300
2018-2022					2,946																			7							1,318
Medicare Part D Subsidy Receipts
2013		(25)
2014		(26)
2015		(28)
2016		(29)
2017		(31)
2018-2022		(173)
Actuarial assumptions for net periodic benefit cost
Discount rate (as a percent)				5.40%	4.70%											5.30%		5.80%					5.00%	4.40%		4.90%	5.50%			5.30%	4.60%				5.20%		5.70%
Rate of compensation increase (as a percent)				3.50%	3.25%													3.50%									3.50%
Expected long-term rate of return on plan assets (as a percent)				7.50%	7.50%													8.00%												7.50%	7.50%						8.00%
Initial health care cost trend rate (as a percent)																														7.50%							8.00%		7.25%		8.00%
Ultimate health care cost trend rate (as a percent)																														5.00%	5.00%						5.00%
Components of net periodic benefit expense (income):
Service cost				40	56												14	53												5	9					2	7
Interest cost				318	389												104	447					1	1			2			124	147					41	183
Expected return on plan assets	(454)	(617)	(146)	(416)	(576)												(133)	(556)												(38)	(41)					(13)	(61)
Recognized prior service cost																	(6)	(22)													1					(26)	(99)
Recognized net actuarial loss																	31	130					1													10	40
Curtailment and settlements																							1
Total net periodic benefit expense (income)				(58)	(131)												10	52					2	1			2			91	116					16	70
Actuarial assumptions for benefit obligation
Discount rate (as a percent)				4.70%	3.70%																		4.40%	3.50%						4.60%	3.60%
Rate of compensation increase (as a percent)				3.25%	3.25%
Initial health care cost trend rate (as a percent)																																						7.25%	6.75%	8.00%	7.50%
Ultimate health care cost trend rate (as a percent)																														5.00%	5.00%						5.00%
Change in benefit obligation
Benefit obligations accrued at beginning of period					8,671	8,237										8,245	8,245							23	31	31		31			3,348	3,284			3,323	3,323
Service cost				40	56												14	53												5	9					2	7
Interest cost				318	389												104	447					1	1			2			124	147					41	183
Actuarial loss				565	882																		2	1						130	185
Plan amendments																														27
Participant contributions																														46	75					15
Benefits paid from plan assets				(489)	(720)												(152)	(760)												(130)	(144)					(47)	(186)
Benefits paid by the company																							(11)	(3)						(159)	(201)					(46)
Medicare Part D reimbursements																														21	19
Benefit obligations accrued at end of period				8,671	9,278	8,237											8,211	8,245					23	22	31		31	31		3,348	3,438	3,284				3,288	3,323
Accumulated benefit obligations				8,667	9,276												8,211						23	22				31		3,348	3,438					3,288
Change in the fair value of plan assets
Fair value of plan assets at the beginning of the period					8,044	7,777										7,660	7,660	7,326													643	762			801	801	863
Actual gain on plan assets	443	1,079	294	449	1,006												133	1,094												11	73					13	124
Benefits paid from plan assets				(489)	(720)												(152)	(760)												(130)	(144)					(47)	(186)
Fair value of plan assets at the end of the period				$ 8,044	$ 8,330	$ 7,777											$ 7,641	$ 7,660												$ 643	$ 572	$ 762				$ 767	$ 801
Target allocation of plan assets
Target asset allocation percentage							55.00%	35.00%	13.50%	6.50%	45.00%	14.00%	14.00%	12.00%	5.00%																		35.00%	65.00%
Expected long-term rate of return on plan assets (as a percent)				7.50%	7.50%													8.00%												7.50%	7.50%						8.00%