Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net benefit cost	$ (1)	$ 7
Total Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	4
Interest cost	53	51
Expected return on plan assets	(56)	(52)
Defined Benefit Plan, Special Termination Benefits	0	13
Prior service cost (benefit)	1	1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(2)	0
Actuarial loss	0	(10)
Net benefit cost	(1)	7
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0
Interest cost	32	31
Expected return on plan assets	(30)	(27)
Defined Benefit Plan, Special Termination Benefits	0	13
Prior service cost (benefit)	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0
Actuarial loss	0	(10)
Net benefit cost	2	7
Executive Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	18
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	4
Interest cost	21	20
Expected return on plan assets	(26)	(25)
Defined Benefit Plan, Special Termination Benefits	0	0
Prior service cost (benefit)	1	1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(2)	0
Actuarial loss	0	0
Net benefit cost	(3)	0
Defined Benefit Plan, Contributions by Employer	15
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	55
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	70
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	0	0
Prior service cost (benefit)	(5)	(5)
Defined Benefit Plan, Amortization of Gains (Losses)	(1)	(1)
Net benefit cost	(4)	(4)
Defined Benefit Plan, Contributions by Employer	1
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	3
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	4
Postemployment Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	4	4
Interest cost	2	2
Defined Benefit Plan, Curtailments	0	(13)
Prior service cost (benefit)	(1)	(1)
Defined Benefit Plan, Amortization of Gains (Losses)	0	(1)
Net benefit cost	5	(7)
Benefit For Reduction In Actuarial Liability		48
Defined Benefit Plan, Contributions by Employer	5
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	30
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 35