Postretirement Benefits (Details 10) (Employee pension plan, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value measurements of pension plan assets:
Total	$ 462	$ 411	$ 348
Level 1
Fair value measurements of pension plan assets:
Total	4	3
Level 2
Fair value measurements of pension plan assets:
Total	458	408
Level 3
Fair value measurements of pension plan assets:
Total	0	0
Total equity securities
Fair value measurements of pension plan assets:
Total	259	255
Total equity securities | Level 1
Fair value measurements of pension plan assets:
Total	0	0
Total equity securities | Level 2
Fair value measurements of pension plan assets:
Total	259	255
Total equity securities | Level 3
Fair value measurements of pension plan assets:
Total	0	0
U.S. equity securities
Fair value measurements of pension plan assets:
Total	165	168
U.S. equity securities | Level 1
Fair value measurements of pension plan assets:
Total	0	0
U.S. equity securities | Level 2
Fair value measurements of pension plan assets:
Total	165	168
U.S. equity securities | Level 3
Fair value measurements of pension plan assets:
Total	0	0
Non-U.S. equity securities
Fair value measurements of pension plan assets:
Total	94	87
Non-U.S. equity securities | Level 1
Fair value measurements of pension plan assets:
Total	0	0
Non-U.S. equity securities | Level 2
Fair value measurements of pension plan assets:
Total	94	87
Non-U.S. equity securities | Level 3
Fair value measurements of pension plan assets:
Total	0	0
Debt securities
Fair value measurements of pension plan assets:
Total	199	153
Debt securities | Level 1
Fair value measurements of pension plan assets:
Total	0	0
Debt securities | Level 2
Fair value measurements of pension plan assets:
Total	199	153
Debt securities | Level 3
Fair value measurements of pension plan assets:
Total	0	0
Other
Fair value measurements of pension plan assets:
Total	4	3
Other | Level 1
Fair value measurements of pension plan assets:
Total	4	3
Other | Level 2
Fair value measurements of pension plan assets:
Total	0	0
Other | Level 3
Fair value measurements of pension plan assets:
Total	$ 0	$ 0