Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net benefit cost	$ 1	$ 5	$ 2	$ 21
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	4	3	10	10
Interest cost	52	51	159	152
Expected return on plan assets	(57)	(51)	(168)	(154)
Prior service cost (benefit)	1	2	2	4
Actuarial loss	1	0	1	(15)
Settlement			(2)	0
Net benefit cost	1	5	2	21
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period			0	24
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0	0	0
Interest cost	32	31	98	93
Expected return on plan assets	(30)	(27)	(89)	(81)
Prior service cost (benefit)	0	0	0	0
Actuarial loss	1	0	1	(15)
Settlement			0	0
Net benefit cost	3	4	10	21
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period			0	24
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	4	3	10	10
Interest cost	20	20	61	59
Expected return on plan assets	(27)	(24)	(79)	(73)
Prior service cost (benefit)	1	2	2	4
Actuarial loss	0	0	0	0
Settlement			(2)	0
Net benefit cost	(2)	1	(8)	0
Defined Benefit Plan, Contributions by Employer	7		38
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			42
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	80		80
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period			0	0
Executive Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Contributions by Employer	0		18
Discretionary Pension Contributions [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			48
Discretionary Pension Contributions [Member] | International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 30		$ 30