Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

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)	2012			2011			2012			2011
Benefit obligation at beginning of period	$	19,293		$	17,506		$	3,570		$	3,298
Service cost	—			—			56			52
Interest cost	930			969			164			180
Actuarial loss	2,334			1,860			147			311
Benefits paid, including lump sums and annuities	(1,057		)	(1,042		)	(310		)	(328		)
Participant contributions	—			—			58			54
Plan amendments	—			—			(219		)	—
Special termination benefits	—			—			116			3
Settlements	(11		)	—			—			—
Benefit obligation at end of period(1)	$	21,489		$	19,293		$	3,582		$	3,570
Fair value of plan assets at beginning of period	$	7,789		$	8,249		$	972		$	1,120
Actual gain (loss) on plan assets	778			(16		)	134			(37		)
Employer contributions	697			598			222			235
Participant contributions	—			—			58			54
Benefits paid, including lump sums and annuities	(1,057		)	(1,042		)	(382		)	(400		)
Settlements	(11		)	—			—			—
Fair value of plan assets at end of period	$	8,196		$	7,789		$	1,004		$	972
Funded status at end of period	$	(13,293	)	$	(11,504	)	$	(2,578	)	$	(2,598	)

⁽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)	2012			2011			2012			2011
Current liabilities	$	(24	)	$	(16	)	$	(132	)	$	(137	)
Noncurrent liabilities	(13,269		)	(11,488		)	(2,446		)	(2,460		)
Total liabilities	$	(13,293	)	$	(11,504	)	$	(2,578	)	$	(2,597	)
Net actuarial loss	$	(7,958	)	$	(5,844	)	$	(473	)	$	(406	)
Prior service cost	—			—			187			(5		)
Total accumulated other comprehensive loss, pretax	$	(7,958	)	$	(5,844	)	$	(286	)	$	(411	)

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)	2012			2011			2010			2012			2011			2010
Service cost	$	—		$	—		$	—		$	56		$	52		$	58
Interest cost	930			969			982			164			180			196
Expected return on plan assets	(705		)	(724		)	(677		)	(77		)	(90		)	(90		)
Amortization of prior service benefit	—			—			—			(21		)	(3		)	(4		)
Recognized net actuarial loss (gain)	143			55			48			23			(11		)	(4		)
Settlements	—			—			14			—			—			—
Special termination benefits	—			—			—			116			—			—
Net periodic cost	$	368		$	300		$	367		$	261		$	128		$	156
Defined contribution plan costs	426			377			334			—			—			—
Total cost	$	794		$	677		$	701		$	261		$	128		$	156

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)	2012		2011
Weighted average discount rate	4.11	%	4.94	%

	Year Ended December 31,
Net Periodic Cost(2)	2012		2011		2010
Weighted average discount rate - pension benefit	4.95	%	5.70	%	5.93	%
Weighted average discount rate - other postretirement benefit(4)	4.63	%	5.55	%	5.75	%
Weighted average discount rate - other postemployment benefit	4.88	%	5.63	%	5.88	%
Weighted average expected long-term rate of return on plan assets	8.94	%	8.93	%	8.82	%
Assumed healthcare cost trend rate(3)	7.00	%	7.00	%	7.50	%

⁽¹⁾  Our 2012 and 2011 benefit obligations are measured using a mortality table projected to 2016 and 2015, 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, 2012 is assumed to decline gradually to 5.00% by 2021 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, 2012, would have the following effects:

(in millions)	1% Increase		1% Decrease
Increase (decrease) in total service and interest cost	$	1	$	(2	)
Increase (decrease) in the accumulated plan benefit obligation	17		(29		)

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
2013	$	1,141	$	275
2014	1,136		276
2015	1,149		276
2016	1,164		274
2017	1,181		270
2018-2022	6,153		1,293

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, 2012
	Target		Actual
Diversified fixed income	23	%	19	%
Domestic equity securities	21		17
Non-U.S. developed equity securities	20		20
Alternative investments	19		23
Non-U.S. emerging equity securities	6		7
Hedge funds	5		5
Cash equivalents	5		7
High yield fixed income	1		2
Total	100	%	100	%

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

	December 31, 2012											December 31, 2011
(in millions)	Total			Level 1		Level 2			Level 3		Valuation Technique	Total			Level 1		Level 2			Level 3		Valuation Technique
Common stock
U.S.	$	575		$	575	$	—		$	—	(a)	$	796		$	796	$	—		$	—	(a)
Non-U.S.	923			886		37			—		(a)	910			875		35			—		(a)
Mutual funds
U.S.	69			—		69			—		(a)	18			—		18			—		(a)
Non-U.S.	129			—		129			—		(a)	246			21		225			—		(a)
Non-U.S. emerging markets	466			—		466			—		(a)	2			—		2			—		(a)
Diversified fixed income	390			—		390			—		(a)	426			—		426			—		(a)
High yield	153			—		153			—		(a)(b)	58			—		58			—		(a)(b)
Commingled funds
U.S.	824			—		824			—		(a)	917			—		917			—		(a)
Non-U.S.	688			—		688			—		(a)	783			—		783			—		(a)
Non-U.S. emerging markets	178			—		178			—		(a)	—			—		—			—		(a)
Diversified fixed income	763			—		763			—		(a)	776			—		776			—		(a)
High yield	38			—		25			13		(a)	103			—		92			11		(a)
Alternative investments
Private equity	1,466			—		—			1,466		(a)(b)	1,517			—		—			1,517		(a)(b)
Real estate and natural resources	613			—		—			613		(a)(b)	527			—		—			527		(a)(b)
Hedge Funds	484			—		—			484		(a)(b)	432			—		—			432		(a)(b)
Fixed income	573			—		573			—		(a)(b)	753			—		753			—		(a)(b)
Foreign currency derivatives
Assets	1,281			—		1,281			—		(a)	738			—		738			—		(a)
Liabilities	(1,285		)	—		(1,285		)	—		(a)	(735		)	—		(735		)	—		(a)
Cash equivalents and other	822			77		745			—		(a)	447			46		401			—		(a)
Total benefit plan assets	$	9,150		$	1,538	$	5,036		$	2,576		$	8,714		$	1,738	$	4,489		$	2,487

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			Common Stock			Commingled Funds			Total
Balance at January 1, 2011	$	1,477		$	478		$	—		$	32		$	40		$	2,027
Actual return on plan assets:
Related to assets still held at the reporting date	64			(8		)	(8		)	3			(10		)	41
Related to assets sold during the period	42			5			—			(6		)	12			53
Purchases, sales and settlements, net	(66		)	52			440			6			(31		)	401
Transfers from Level 3	—			—			—			(35		)	—			(35		)
Balance at December 31, 2011	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 to Level 3	—			—			13			—			—			13
Balance at December 31, 2012	$	1,466		$	613		$	484		$	—		$	13		$	2,576