|
Employee Benefits, Changes in Fair Value in Pension Plan And Other Benefits Plan Assets Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
Other benefits plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
$ 48 |
$ 32 |
| Gross Realized Gain (Loss) |
0 |
(9) |
| Gross Unrealized Gain (Loss) |
0 |
8 |
| Purchases, sales, issuances and settlements, net |
(1) |
17 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
47 |
48 |
|
Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
847 |
836 |
| Gross Realized Gain (Loss) |
20 |
10 |
| Gross Unrealized Gain (Loss) |
34 |
34 |
| Purchases, sales, issuances and settlements, net |
(109) |
(35) |
| Transfers into Level 3 |
0 |
2 |
| Balance end of year |
792 |
847 |
|
Long duration fixed income [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
0 |
|
| Gross Realized Gain (Loss) |
0 |
|
| Gross Unrealized Gain (Loss) |
0 |
|
| Purchases, sales, issuances and settlements, net |
1 |
|
| Transfers into Level 3 |
0 |
|
| Balance end of year |
1 |
|
|
Intermediate (core) fixed income [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
10 |
9 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
1 |
2 |
| Purchases, sales, issuances and settlements, net |
(5) |
(3) |
| Transfers into Level 3 |
0 |
2 |
| Balance end of year |
6 |
10 |
|
High-yield fixed income [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
1 |
0 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, issuances and settlements, net |
0 |
1 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
1 |
1 |
|
Domestic large-cap stocks [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
4 |
5 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
(1) |
1 |
| Purchases, sales, issuances and settlements, net |
(1) |
(2) |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
2 |
4 |
|
International stocks [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
6 |
1 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
(1) |
2 |
| Purchases, sales, issuances and settlements, net |
(4) |
3 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
1 |
6 |
|
Real estate/timber[Member] | Other benefits plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
12 |
4 |
| Gross Realized Gain (Loss) |
0 |
(7) |
| Gross Unrealized Gain (Loss) |
0 |
10 |
| Purchases, sales, issuances and settlements, net |
0 |
5 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
12 |
12 |
|
Real estate/timber[Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
360 |
353 |
| Gross Realized Gain (Loss) |
10 |
(6) |
| Gross Unrealized Gain (Loss) |
22 |
8 |
| Purchases, sales, issuances and settlements, net |
(37) |
5 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
355 |
360 |
|
Multi-strategy hedge funds [Member] | Other benefits plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
10 |
5 |
| Gross Realized Gain (Loss) |
0 |
(1) |
| Gross Unrealized Gain (Loss) |
0 |
(3) |
| Purchases, sales, issuances and settlements, net |
(2) |
9 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
8 |
10 |
|
Multi-strategy hedge funds [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
313 |
339 |
| Gross Realized Gain (Loss) |
5 |
6 |
| Gross Unrealized Gain (Loss) |
(3) |
12 |
| Purchases, sales, issuances and settlements, net |
(64) |
(44) |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
251 |
313 |
|
Private equity [Member] | Other benefits plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
4 |
2 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
1 |
| Purchases, sales, issuances and settlements, net |
0 |
1 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
4 |
4 |
|
Private equity [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
112 |
83 |
| Gross Realized Gain (Loss) |
1 |
1 |
| Gross Unrealized Gain (Loss) |
16 |
10 |
| Purchases, sales, issuances and settlements, net |
0 |
18 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
129 |
112 |
|
Other [Member] | Other benefits plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
22 |
21 |
| Gross Realized Gain (Loss) |
0 |
(1) |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, issuances and settlements, net |
1 |
2 |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
23 |
22 |
|
Other [Member] | Pension plan assets [Member]
|
|
|
| Changes in Level Three Pension Plan Assets Measured at Fair Value [Abstract] |
|
|
| Balance beginning of year |
41 |
46 |
| Gross Realized Gain (Loss) |
4 |
9 |
| Gross Unrealized Gain (Loss) |
0 |
(1) |
| Purchases, sales, issuances and settlements, net |
1 |
(13) |
| Transfers into Level 3 |
0 |
0 |
| Balance end of year |
$ 46 |
$ 41 |