Pension Plans, Retirement Benefits and Savings Plans (details) - Summary of Funded Status and Obligations (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plans [Member]
Defined benefit plan disclosure
Funded status of plan at end of year	$ (389,000,000)	$ (147,000,000)
Accrued under-funded benefit plan liabilities	(389,000,000)	(147,000,000)
Net actuarial loss (gain)	1,275,000,000	964,000,000
Total amount recognized in accumulated other changes in equity from nownowner sources	1,275,000,000	964,000,000
Total accumulated benefit obligation	2,830,000,000	2,540,000,000
Aggregate projected benefit obligation for pension plans with an accumulated benefit obligation in excess of plan assets	2,880,000,000
Aggregate accumulated benefit obligation for pension plans with an accumulated benefit obligation in excess of plan assets	2,820,000,000
Fair value of plan assets for pension plans with an accumulated benefit obligation in excess of plan assets	2,490,000,000	2,420,000,000
Service cost	98,000,000	96,000,000	80,000,000
Interest cost on benefit obligation	135,000,000	128,000,000	125,000,000
Expected return on plan assets	(182,000,000)	(185,000,000)	(176,000,000)
Amortization of unrecognized prior service benefit		(3,000,000)	(6,000,000)
Amortization of unrecognized net actuarial loss	76,000,000	60,000,000	22,000,000
Net periodic benefit cost, net benefit expense	127,000,000	96,000,000	45,000,000
Other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources, net actuarial loss (gain)	388,000,000	27,000,000	147,000,000
Other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources, amortization of prior service benefit		3,000,000	6,000,000
Other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources, amortization of net actuarial (loss) gain	(76,000,000)	(60,000,000)	(22,000,000)
Total other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources	312,000,000	(30,000,000)	131,000,000
Total other changes recognized in net benefit expense and accumulated other changes in equity from nonowner sources	439,000,000	66,000,000	176,000,000
Assumptions used to determine net periodic benefit cost, expected long-term rate of return on assets (percent)	8.00%	8.00%
Benefits expected to be paid, 2012	166,000,000
Benefits expected to be paid, 2013	171,000,000
Benefits expected to be paid, 2014	185,000,000
Benefits expected to be paid, 2015	195,000,000
Benefits expected to be paid, 2016	208,000,000
Benefits expected to be paid, 2017 through 2021	1,154,000,000
Qualified Domestic Pension Plan [Member]
Defined benefit plan disclosure
Funded status of plan at end of year	(292,000,000)	(57,000,000)
Accrued under-funded benefit plan liabilities	(292,000,000)	(57,000,000)
Net actuarial loss (gain)	1,220,000,000	915,000,000
Total amount recognized in accumulated other changes in equity from nownowner sources	1,220,000,000	915,000,000
Total accumulated benefit obligation	2,650,000,000	2,370,000,000
Nonqualified and Foreign Pension Plans [Member]
Defined benefit plan disclosure
Funded status of plan at end of year	(97,000,000)	(90,000,000)
Accrued under-funded benefit plan liabilities	(97,000,000)	(90,000,000)
Net actuarial loss (gain)	55,000,000	49,000,000
Total amount recognized in accumulated other changes in equity from nownowner sources	55,000,000	49,000,000
Total accumulated benefit obligation	180,000,000	170,000,000
Postretirement Benefit Plans [Member]
Defined benefit plan disclosure
Funded status of plan at end of year	(227,000,000)	(234,000,000)
Accrued under-funded benefit plan liabilities	(227,000,000)	(237,000,000)
Net actuarial loss (gain)	(31,000,000)	(27,000,000)
Service cost		1,000,000	1,000,000
Interest cost on benefit obligation	13,000,000	14,000,000	17,000,000
Expected return on plan assets	(1,000,000)	(1,000,000)	(1,000,000)
Net periodic benefit cost, net benefit expense	12,000,000	14,000,000	17,000,000
Other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources, net actuarial loss (gain)	(5,000,000)	(8,000,000)	(5,000,000)
Total other changes in benefit plan assets and benefit obligations recognized in accumulated other changes in equity from nonowner sources	(5,000,000)	(8,000,000)	(5,000,000)
Total other changes recognized in net benefit expense and accumulated other changes in equity from nonowner sources	7,000,000	6,000,000	12,000,000
Assumptions used to determine net periodic benefit cost, expected long-term rate of return on assets (percent)	5.00%	5.00%
Benefits expected to be paid, 2012	19,000,000
Benefits expected to be paid, 2013	20,000,000
Benefits expected to be paid, 2014	21,000,000
Benefits expected to be paid, 2015	21,000,000
Benefits expected to be paid, 2016	21,000,000
Benefits expected to be paid, 2017 through 2021	$ 102,000,000