Pension and Other Postretirement Employee Benefit Plans - Weighted Average Asset Allocation (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
US Pension Plans and Other US Postretirement Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Amount Of Plan Investments Held In Funds That Are Sponsored Or Managed By Affiliates Of Entity	$ 2,900	$ 1,800
Defined benefit pension plan, U.S. [Member]
Asset category
Target plan asset allocations	100.00%
Actual plan asset allocations	100.00%	100.00%
Defined benefit pension plan, U.S. [Member] | Equity securities [Member]
Asset category
Actual plan asset allocations	48.00%	41.00%
Defined benefit pension plan, U.S. [Member] | Debt securities [Member]
Asset category
Actual plan asset allocations	25.00%	20.00%
Defined benefit pension plan, U.S. [Member] | Real estate [Member]
Asset category
Actual plan asset allocations	4.00%	5.00%
Defined benefit pension plan, U.S. [Member] | Alternative Investments [Member]
Asset category
Actual plan asset allocations	23.00%	34.00%
Defined benefit pension plan, Non-U.S. [Member]
Asset category
Target plan asset allocations	100.00%
Actual plan asset allocations	100.00%	100.00%
Defined benefit pension plan, Non-U.S. [Member] | Equity securities [Member]
Asset category
Target plan asset allocations	35.00%
Actual plan asset allocations	36.00%	27.00%
Defined benefit pension plan, Non-U.S. [Member] | Debt securities [Member]
Asset category
Target plan asset allocations	64.00%
Actual plan asset allocations	63.00%	72.00%
Defined benefit pension plan, Non-U.S. [Member] | Real estate [Member]
Asset category
Target plan asset allocations	0.00%
Actual plan asset allocations	0.00%	0.00%
Defined benefit pension plan, Non-U.S. [Member] | Alternative Investments [Member]
Asset category
Target plan asset allocations	1.00%
Actual plan asset allocations	1.00%	1.00%
OPEB Plans [Member]
Asset category
Target plan asset allocations	100.00%
Actual plan asset allocations	100.00%	100.00%
OPEB Plans [Member] | Equity securities [Member]
Asset category
Target plan asset allocations	50.00%
Actual plan asset allocations	50.00%	50.00%
OPEB Plans [Member] | Debt securities [Member]
Asset category
Target plan asset allocations	50.00%
Actual plan asset allocations	50.00%	50.00%
OPEB Plans [Member] | Real estate [Member]
Asset category
Target plan asset allocations	0.00%
Actual plan asset allocations	0.00%	0.00%
OPEB Plans [Member] | Alternative Investments [Member]
Asset category
Target plan asset allocations	0.00%
Actual plan asset allocations	0.00%	0.00%
Foreign Pension Plans and Other Foreign Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Amount Of Plan Investments Held In Funds That Are Sponsored Or Managed By Affiliates Of Entity	$ 242	$ 220
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Equity securities [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | United States Equity Securities Member [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | International Equity Securities [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Hedge funds [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Real estate [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Real assets [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Private equity investments [Member]
Asset category
Target Allocation, Minimum	0.00%
Minimum [Member] | Defined benefit pension plan, U.S. [Member] | Alternative Investments [Member]
Asset category
Target Allocation, Minimum	0.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Equity securities [Member]
Asset category
Target Allocation, Maximum	85.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | United States Equity Securities Member [Member]
Asset category
Target Allocation, Maximum	45.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | International Equity Securities [Member]
Asset category
Target Allocation, Maximum	40.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Hedge funds [Member]
Asset category
Target Allocation, Maximum	20.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Real estate [Member]
Asset category
Target Allocation, Maximum	10.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Real assets [Member]
Asset category
Target Allocation, Maximum	10.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Private equity investments [Member]
Asset category
Target Allocation, Maximum	20.00%
Maximum [Member] | Defined benefit pension plan, U.S. [Member] | Alternative Investments [Member]
Asset category
Target Allocation, Maximum	50.00%
Debt securities [Member] | Minimum [Member] | Defined benefit pension plan, U.S. [Member]
Asset category
Target Allocation, Minimum	0.00%
Debt securities [Member] | Maximum [Member] | Defined benefit pension plan, U.S. [Member]
Asset category
Target Allocation, Maximum	80.00%