Benefit Plans (Fair Value of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
U.S. Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 941		$ 883		$ 762
U.S. Defined Benefit Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	720		629
U.S. Defined Benefit Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	221		254
U.S. Defined Benefit Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	46		134
U.S. Defined Benefit Plans | Equity Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	46		134
U.S. Defined Benefit Plans | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	303		151
U.S. Defined Benefit Plans | Equity Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	303		151
U.S. Defined Benefit Plans | US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	32		32
U.S. Defined Benefit Plans | US Treasury and Government | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	24		32
U.S. Defined Benefit Plans | US Treasury and Government | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	8
U.S. Defined Benefit Plans | Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	159		153
U.S. Defined Benefit Plans | Corporate Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets			4
U.S. Defined Benefit Plans | Corporate Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	159		149
U.S. Defined Benefit Plans | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	251	[1]	227	[1]
U.S. Defined Benefit Plans | Fixed Income Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	251	[1]	227	[1]
U.S. Defined Benefit Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	23
U.S. Defined Benefit Plans | Real Estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	23
U.S. Defined Benefit Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	56		43
U.S. Defined Benefit Plans | Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	56		43
U.S. Defined Benefit Plans | Other Plan Investments
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	71		143
U.S. Defined Benefit Plans | Other Plan Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	40		38
U.S. Defined Benefit Plans | Other Plan Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	31		105
Foreign Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	3,605		4,712		4,400
Foreign Defined Benefit Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	546		634
Foreign Defined Benefit Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2,529		3,443
Foreign Defined Benefit Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	530		635		755
Foreign Defined Benefit Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	23		28
Foreign Defined Benefit Plans | Equity Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	23		28
Foreign Defined Benefit Plans | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	322		457
Foreign Defined Benefit Plans | Equity Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	322		457
Foreign Defined Benefit Plans | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	370	[2]	446	[2]
Foreign Defined Benefit Plans | Private Equity Funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	370	[2]	446	[2]
Foreign Defined Benefit Plans | Certificates of Deposit
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2		3
Foreign Defined Benefit Plans | Certificates of Deposit | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2		3
Foreign Defined Benefit Plans | Unsecured Debentures
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	13		16
Foreign Defined Benefit Plans | Unsecured Debentures | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	13		16
Foreign Defined Benefit Plans | Foreign Government Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	107		215
Foreign Defined Benefit Plans | Foreign Government Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	12		9
Foreign Defined Benefit Plans | Foreign Government Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	95		206
Foreign Defined Benefit Plans | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2,584	[1]	3,347	[1]
Foreign Defined Benefit Plans | Fixed Income Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	174	[1]	139	[1]
Foreign Defined Benefit Plans | Fixed Income Funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2,410	[1]	3,208	[1]
Foreign Defined Benefit Plans | Other Debt Obligations
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	9		10
Foreign Defined Benefit Plans | Other Debt Obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	9		10
Foreign Defined Benefit Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	100	[2]	121	[2]
Foreign Defined Benefit Plans | Real Estate | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	100	[2]	121	[2]
Foreign Defined Benefit Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	15		1
Foreign Defined Benefit Plans | Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	15		1
Foreign Defined Benefit Plans | Participant Loan
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	60	[3]	68	[3]
Foreign Defined Benefit Plans | Participant Loan | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 60	[3]	$ 68	[3]

[1] Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment.

[2] Plan assets of our Brazilian subsidiaries are invested in private equities and commercial real estate through the plan administrator in Brazil. The fair value of these assets is determined using the income approach through annual appraisals based on a discounted cash flow analysis.

[3] Loans to participants are stated at cost, which approximates fair value.