Retirement Benefits (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended
	Dec. 03, 2014	Jan. 31, 2008 Y	Dec. 31, 2014 employee	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2007 Y	Sep. 30, 2014	Dec. 31, 2014	Jan. 01, 2007
Defined Benefit Plan Disclosure [Line Items]
Additional eligible compensation after IRS limit									$ 175,000
Number of years of high earnings		5				5
Calendar years used to calculate benefits rolling average		10 years				10 years
Regular Pension Plan vesting period		3 years				5 years
Decrease in accumulated other comprehensive loss				87,000,000
Prior service cost credit			50,000,000	43,000,000	16,000,000
Number of retirees receiving pension payments from annuity			30,000
Transfer of plan assets	3,200,000,000
Period of market-related asset value method of recognizing assets related gains and losses			5 years
Health care cost, trend rate			7.75%	8.50%
Health care cost, grade down rate			5.00%	5.00%
Employer percentage of matching			4.00%
Maximum employer contribution for board officers			50,000
Expenses for material defined contribution plans			31,000,000	32,000,000	30,000,000
Discretionary matching contributions made during period			0	0	0
U.S. Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost credit			0	0	0
Lump sum distribution to participants expense			1,031,000,000	0
Benefits paid			281,000,000	311,000,000
Lump-sum distribution to certain participants pension benefits, related to certain participants pension benefits			(1,883,000,000)	0	0
Accumulated other comprehensive income (Loss), unrecognized net loss and prior service cost			47,000,000					47,000,000
Weighted average discount rate of remeasured plans			5.15%	4.35%
Expected long-term rates of return on assets			7.00%	7.00%
Company contributions			1,112,000,000	150,000,000
Expected contributions			0
Net periodic pension cost			1,969,000,000	118,000,000	188,000,000
Actuarial present value of the future death benefits			4,536,000,000	7,317,000,000	8,288,000,000			4,536,000,000
Non U.S. Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost credit			7,000,000	6,000,000	3,000,000
Lump sum distribution to participants expense			0	0
Benefits paid			43,000,000	39,000,000
Lump-sum distribution to certain participants pension benefits, related to certain participants pension benefits			0	0	0
Accumulated other comprehensive income (Loss), unrecognized net loss and prior service cost			11,000,000					11,000,000
Weighted average discount rate of remeasured plans			4.24%	4.20%
Expected long-term rates of return on assets			5.92%	6.13%
Company contributions			237,000,000	32,000,000
Expected contributions			12,000,000
Net periodic pension cost			10,000,000	10,000,000	25,000,000
Actuarial present value of the future death benefits			2,075,000,000	1,904,000,000	1,771,000,000			2,075,000,000
Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Amortization period of prior service cost			3 years
Prior service cost credit			50,000,000	43,000,000	16,000,000
Lump sum distribution to participants expense			0	0
Benefits paid			23,000,000	20,000,000
Lump-sum distribution to certain participants pension benefits, related to certain participants pension benefits			0	0	0
Amortization of net credit to be included in net periodic expense			49,000,000
Weighted average discount rate of remeasured plans			4.65%	3.80%			4.15%
Expected long-term rates of return on assets			7.00%	7.00%			7.00%
Company contributions			0	0
Net periodic pension cost			(39,000,000)	(26,000,000)	3,000,000
Actuarial present value of the future death benefits			212,000,000	278,000,000	322,000,000			212,000,000
Split-dollar Life Insurance Arrangement
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost			5,000,000	5,000,000	5,000,000
Actuarial present value of the future death benefits			66,000,000	51,000,000				66,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Amortization period of prior service cost			6 years
Period range of amortizing gains and losses recognized			4 years		3 years
Maximum
Defined Benefit Plan Disclosure [Line Items]
Amortization period of prior service cost			12 years
Period range of amortizing gains and losses recognized			36 years		13 years
Accumulated Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Remeasurement of plan							45,000,000
Other charges
Defined Benefit Plan Disclosure [Line Items]
Lump-sum distribution to certain participants pension benefits, related to certain participants pension benefits							1,900,000,000
Regular Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Lump sum distribution to participants expense							1,000,000,000
Benefits paid								$ 1,000,000,000
Regular Pension Plan | Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate of remeasured plans							4.25%
Expected long-term rates of return on assets							4.25%
The New Plan | Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate of remeasured plans							4.70%
Expected long-term rates of return on assets							7.00%