Postretirement Benefit Plans (Details 11) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 524	$ 477
Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	260	225
Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	195	192
Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	69	60	67
Global stock funds/securities
Defined Benefit Plan Disclosure
Fair value of plan assets	123	93
Global stock funds/securities | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	108	79
Global stock funds/securities | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	11	11
Global stock funds/securities | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	4	3
Index funds
Defined Benefit Plan Disclosure
Fair value of plan assets	40	46
Index funds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	3	3
Index funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	37	43
Index funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Emerging markets funds
Defined Benefit Plan Disclosure
Fair value of plan assets	3	0
Emerging markets funds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	3	0
Emerging markets funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Emerging markets funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Corporate bonds
Defined Benefit Plan Disclosure
Fair value of plan assets	95	100
Corporate bonds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	40	32
Corporate bonds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	48	59
Corporate bonds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	7	9
Government bonds
Defined Benefit Plan Disclosure
Fair value of plan assets	35	26
Government bonds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	35	23
Government bonds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0	3
Government bonds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Absolute return
Defined Benefit Plan Disclosure
Fair value of plan assets	123	140
Absolute return | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	9	44
Absolute return | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	95	76
Absolute return | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	19	20	37
Private equity
Defined Benefit Plan Disclosure
Fair value of plan assets	22	24
Private equity | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Private equity | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Private equity | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	22	24	24
Insurance contracts and other
Defined Benefit Plan Disclosure
Fair value of plan assets	83	48
Insurance contracts and other | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	62	44
Insurance contracts and other | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	4	0
Insurance contracts and other | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 17	$ 4