Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Pre-Tax) in 2011) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial loss	$ 139	$ 55	$ 242
Total recognized in other comprehensive loss (pre-tax)	70	$ 79	$ 233
United States Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial loss	73
Actuarial (loss) recognized during the year	(51)
Current year prior service cost (credit)	0
Prior service credit (cost) recognized during the year	3
Total recognized in other comprehensive loss (pre-tax)	25
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax)	36
Foreign Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial loss	83
Actuarial (loss) recognized during the year	(6)
Current year prior service cost (credit)	0
Prior service credit (cost) recognized during the year	0
Total recognized in other comprehensive loss (pre-tax)	77
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax)	85
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial loss	(17)
Actuarial (loss) recognized during the year	0
Current year prior service cost (credit)	(30)
Prior service credit (cost) recognized during the year	15
Total recognized in other comprehensive loss (pre-tax)	(32)
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax)	$ (22)