Pension Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Expense for all defined benefit and defined contributions pension plans	$ 210	$ 193	$ 181
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net prior service credits, before tax	1
Unrecognized net prior service credits, net of tax	1
Unrecognized actuarial losses, before tax	1,100
Unrecognized actuarial losses, net of tax	720
Future amortization of prior service cost (credit)	0.2
Prior service credits expected to be recognized accumulated comprehensive income in net periodic pension cost, net of tax	0.1
Prior service credits expected to be recognized accumulated comprehensive income in net periodic pension cost, before tax	43
Actuarial loss expected to be recognized accumulated comprehensive income in net periodic pension cost, net of tax	30
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions	7.50%	7.50%	7.50%
Percentage of plan assets in equity portfolios, minimum	60.00%
Percentage of plan assets in equity portfolios, maximum	70.00%
Employer contributions	51.8	4.3
Expected employer contributions within the next year	25
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions	4.80%	4.65%
Weighted average rate of return assumption	4.80%	4.65%
Employer contributions	61.8	53.4
Expected employer contributions within the next year	$ 55
Minimum | Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions	1.25%	1.25%
Maximum | Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions	7.10%	6.70%