Pension, Other Postretirement Benefits and Savings Plans (Change in Fair Value of Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
U.S.
Defined Benefit Plan Disclosure [Line Items]
Ending balance	$ 4,800	$ 4,100
U.S. | Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Ending balance	0	0
U.S. | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Ending balance	37	48
U.S. | Fair Value, Inputs, Level 3 | Partnership Interests
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	191	157
Realized gains (losses)	6	4
Unrealized gains (losses) relating to instruments still held at the reporting date	12	0
Purchases, sales, issuances and settlements (net)	0	30
Transfers in to Level 3		0
Foreign currency translation	0	0
Ending balance	209	191
U.S. | Fair Value, Inputs, Level 3 | Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Ending balance	0	0
U.S. | Fair Value, Inputs, Level 3 | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Ending balance	0	0
U.S. | Fair Value, Inputs, Level 3 | Other Plan Investments
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	3	2
Realized gains (losses)	0	0
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Purchases, sales, issuances and settlements (net)	3	0
Transfers in to Level 3		1
Foreign currency translation	0	0
Ending balance	6	3
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Ending balance	2,455	2,354
Non-U.S. | Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Ending balance	171	150
Non-U.S. | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Ending balance	173	142
Non-U.S. | Fair Value, Inputs, Level 3 | Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	143	122
Realized gains (losses)	0	0
Unrealized gains (losses) relating to instruments still held at the reporting date	16	5
Purchases, sales, issuances and settlements (net)	0	10
Transfers in to Level 3		0
Foreign currency translation	4	6
Ending balance	163	143
Non-U.S. | Fair Value, Inputs, Level 3 | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	138	122
Realized gains (losses)	0	0
Unrealized gains (losses) relating to instruments still held at the reporting date	9	0
Purchases, sales, issuances and settlements (net)	19	10
Transfers in to Level 3		0
Foreign currency translation	4	6
Ending balance	170	138
Non-U.S. | Fair Value, Inputs, Level 3 | Other Plan Investments
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	19	19
Realized gains (losses)	0	0
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Purchases, sales, issuances and settlements (net)	0	0
Transfers in to Level 3		0
Foreign currency translation	0	0
Ending balance	$ 19	$ 19