Pension Plans, Retirement Benefits and Savings Plans (details) - Change in Projected Benefit Obligation (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Plans [Member]
Change in projected benefit obligation [Roll Forward]
Benefit obligation, balance, beginning of year	$ 2,572	$ 2,387
Benefits earned	98	96
Interest cost on benefit obligation, change in projected benefit obligation	135	128
Actuarial loss (gain)	214	83
Benefits paid	(130)	(120)
Foreign currency exchange rate change, change in projected benefit obligation		(2)
Benefit obligation, balance, end of year	2,889	2,572
Qualified Domestic Pension Plan [Member]
Change in projected benefit obligation [Roll Forward]
Benefit obligation, balance, beginning of year	2,399	2,214
Benefits earned	93	91
Interest cost on benefit obligation, change in projected benefit obligation	125	119
Actuarial loss (gain)	207	82
Benefits paid	(118)	(107)
Benefit obligation, balance, end of year	2,706	2,399
Nonqualified and Foreign Pension Plans [Member]
Change in projected benefit obligation [Roll Forward]
Benefit obligation, balance, beginning of year	173	173
Benefits earned	5	5
Interest cost on benefit obligation, change in projected benefit obligation	10	9
Actuarial loss (gain)	7	1
Benefits paid	(12)	(13)
Foreign currency exchange rate change, change in projected benefit obligation		(2)
Benefit obligation, balance, end of year	183	173
Postretirement Benefit Plans [Member]
Change in projected benefit obligation [Roll Forward]
Benefit obligation, balance, beginning of year	254	264
Benefits earned		1
Interest cost on benefit obligation, change in projected benefit obligation	13	14
Actuarial loss (gain)	(4)	(8)
Benefits paid	(17)	(17)
Benefit obligation, balance, end of year	$ 246	$ 254