Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Benefit Obligations, Fair Value of Plan Assets and Funded Status

	Pension Benefits						Other Postretirement and Postemployment Benefits
	December 31,						December 31,
(in millions)	2013			2012			2013			2012
Benefit obligation at beginning of period	$	21,489		$	19,293		$	3,582		$	3,570
Service cost	—			—			49			56
Interest cost	861			930			143			164
Actuarial (gain) loss	(2,212		)	2,334			(301		)	147
Benefits paid, including lump sums and annuities	(1,078		)	(1,057		)	(313		)	(310		)
Participant contributions	—			—			45			58
Plan amendments	—			—			—			(219		)
Special termination benefits	—			—			—			116
Settlements	—			(11		)	—			—
Benefit obligation at end of period(1)	$	19,060		$	21,489		$	3,205		$	3,582
Fair value of plan assets at beginning of period	$	8,196		$	7,789		$	1,004		$	972
Actual gain on plan assets	905			778			129			134
Employer contributions	914			697			191			222
Participant contributions	—			—			45			58
Benefits paid, including lump sums and annuities	(1,078		)	(1,057		)	(326		)	(382		)
Settlements	—			(11		)	—			—
Fair value of plan assets at end of period	$	8,937		$	8,196		$	1,043		$	1,004
Funded status at end of period	$	(10,123	)	$	(13,293	)	$	(2,162	)	$	(2,578	)

⁽¹⁾  At each period-end presented, our accumulated benefit obligations for our pension plans are equal to the benefit obligations shown above.

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Balance Sheet Position

	Pension Benefits						Other Postretirement and Postemployment Benefits
	December 31,						December 31,
(in millions)	2013			2012			2013			2012
Current liabilities	$	(22	)	$	(24	)	$	(139	)	$	(132	)
Noncurrent liabilities	(10,101		)	(13,269		)	(2,023		)	(2,446		)
Total liabilities	$	(10,123	)	$	(13,293	)	$	(2,162	)	$	(2,578	)
Net actuarial loss	$	(5,349	)	$	(7,958	)	$	(103	)	$	(473	)
Prior service credit	—			—			161			187
Total accumulated other comprehensive income (loss), pre-tax	$	(5,349	)	$	(7,958	)	$	58		$	(286	)

Schedule of Net Benefit Costs [Table Text Block]

Net Periodic Cost

	Pension Benefits									Other Postretirement and Postemployment Benefits
	Year Ended December 31,									Year Ended December 31,
(in millions)	2013			2012			2011			2013			2012			2011
Service cost	$	—		$	—		$	—		$	49		$	56		$	52
Interest cost	861			930			969			143			164			180
Expected return on plan assets	(734		)	(705		)	(724		)	(84		)	(77		)	(90		)
Amortization of prior service credit	—			—			—			(26		)	(21		)	(3		)
Recognized net actuarial loss (gain)	221			143			55			25			23			(11		)
Settlements	6			—			—			—			—			—
Special termination benefits	—			—			—			—			116			—
Net periodic cost	$	354		$	368		$	300		$	107		$	261		$	128
Defined contribution plan costs	490			426			377			—			—			—
Total cost	$	844		$	794		$	677		$	107		$	261		$	128

Schedule of Assumptions Used [Table Text Block]

We used the following actuarial assumptions to determine our benefit obligations and our net periodic cost for the periods presented:

	December 31,
Benefit Obligations(1)(2)	2013		2012
Weighted average discount rate	5.01	%	4.11	%

	Year Ended December 31,
Net Periodic Cost(2)	2013		2012		2011
Weighted average discount rate - pension benefit	4.10	%	4.95	%	5.70	%
Weighted average discount rate - other postretirement benefit(4)	4.00	%	4.63	%	5.55	%
Weighted average discount rate - other postemployment benefit	4.13	%	4.88	%	5.63	%
Weighted average expected long-term rate of return on plan assets	8.94	%	8.94	%	8.93	%
Assumed healthcare cost trend rate(3)	7.00	%	7.00	%	7.00	%

⁽¹⁾  Our 2013 and 2012 benefit obligations are measured using a mortality table projected to 2017 and 2016, respectively.

⁽²⁾  Future compensation levels do not impact our frozen defined benefit pension plans or other postretirement plans and impact only a small portion of our other postemployment liability.

⁽³⁾  Assumed healthcare cost trend rate at December 31, 2013 is assumed to decline gradually to 5.00% by 2022 and remain level thereafter.

⁽⁴⁾  Our assumptions reflect various remeasurements of certain portions of our obligations and represent the weighted average of the assumptions used for each measurement date.

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

A 1% change in the healthcare cost trend rate used in measuring the accumulated plan benefit obligation for these plans at December 31, 2013, would have the following effects:

(in millions)	1% Increase		1% Decrease
Increase (decrease) in total service and interest cost	$	1	$	(1	)
Increase (decrease) in the accumulated plan benefit obligation	15		(25		)

Schedule of Expected Benefit Payments [Table Text Block]

The following table summarizes, the benefit payments that are scheduled to be paid in the years ending December 31:

(in millions)	Pension Benefits		Other Postretirement and Postemployment Benefits
2014	$	1,128	$	272
2015	1,136		272
2016	1,154		273
2017	1,175		270
2018	1,194		264
2019-2023	6,226		1,311

Schedule of Allocation of Plan Assets [Table Text Block]

The weighted average target and actual asset allocations for the plans are as follows:

	December 31, 2013
	Target		Actual
Diversified fixed income	23	%	12	%
Domestic equity securities	21		14
Non-U.S. developed equity securities	20		23
Alternative investments	19		21
Non-U.S. emerging equity securities	6		6
Hedge funds	5		6
Cash equivalents	5		14
High yield fixed income	1		4
Total	100	%	100	%

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	December 31, 2013									December 31, 2012
(in millions)	Total		Level 1		Level 2		Level 3		Valuation Technique	Total		Level 1		Level 2		Level 3		Valuation Technique
Common stock
U.S.	$	558	$	558	$	—	$	—	(a)	$	575	$	575	$	—	$	—	(a)
Non-U.S.	1,269		1,216		53		—		(a)	923		886		37		—		(a)
Mutual funds
U.S.	3		—		3		—		(a)	69		—		69		—		(a)
Non-U.S.	43		—		43		—		(a)	129		—		129		—		(a)
Non-U.S. emerging markets	327		—		327		—		(a)	466		—		466		—		(a)
Diversified fixed income	218		—		218		—		(a)	390		—		390		—		(a)
High yield	348		—		348		—		(a)(b)	153		—		153		—		(a)(b)
Commingled funds
U.S.	864		—		864		—		(a)	824		—		824		—		(a)
Non-U.S.	782		—		782		—		(a)	688		—		688		—		(a)
Non-U.S. emerging markets	319		—		319		—		(a)	178		—		178		—		(a)
Diversified fixed income	680		—		680		—		(a)	763		—		763		—		(a)
High yield	98		—		39		59		(a)	38		—		25		13		(a)
Alternative investments
Private equity	1,366		—		—		1,366		(a)(b)	1,466		—		—		1,466		(a)(b)
Real estate and natural resources	688		—		—		688		(a)(b)	613		—		—		613		(a)(b)
Hedge Funds	552		—		—		552		(a)(b)	484		—		—		484		(a)(b)
Fixed income	155		—		155		—		(a)(b)	573		—		573		—		(a)(b)
Cash equivalents and other	1,610		28		1,582		—		(a)	818		77		741		—		(a)
Total benefit plan assets	$	9,880	$	1,802	$	5,413	$	2,665		$	9,150	$	1,538	$	5,036	$	2,576

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table shows the changes in our benefit plan assets classified in Level 3:

(in millions)	Private Equity			Real Estate			Hedge Funds			Commingled Funds		Total
Balance at January 1, 2012	$	1,517		$	527		$	432		$	11	$	2,487
Actual return on plan assets:
Related to assets still held at the reporting date	—			(11		)	50			2		41
Related to assets sold during the period	44			8			(9		)	—		43
Purchases, sales and settlements, net	(95		)	89			(2		)	—		(8		)
Transfers from Level 3	—			—			13			—		13
Balance at December 31, 2012	1,466			613			484			13		2,576
Actual return on plan assets:
Related to assets still held at the reporting date	98			61			49			2		210
Related to assets sold during the period	64			19			—			—		83
Purchases, sales and settlements, net	(262		)	(5		)	19			44		(204		)
Transfers to Level 3	—			—			—			—		—
Balance at December 31, 2013	$	1,366		$	688		$	552		$	59	$	2,665