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Pension and Postretirement Benefit Plans (Components of net periodic benefit cost and other information) (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
United States Qualified and Non-qualified Pension Benefits      
Benefit Plan Information      
Total, before other items to reconcile $ 14,125 $ 14,818  
Other items to reconcile to fair value of plan assets (159) (175)  
Fair value of plan assets 13,966 14,643 $ 13,889
United States Qualified and Non-qualified Pension Benefits | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 4,532 4,367  
United States Qualified and Non-qualified Pension Benefits | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 4,113 4,699  
United States Qualified and Non-qualified Pension Benefits | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (106) (74)  
United States Qualified and Non-qualified Pension Benefits | Equities      
Benefit Plan Information      
Total, before other items to reconcile 3,624 3,587  
United States Qualified and Non-qualified Pension Benefits | Equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 3,046 2,980  
United States Qualified and Non-qualified Pension Benefits | U.S. equities      
Benefit Plan Information      
Total, before other items to reconcile 1,897 1,766  
United States Qualified and Non-qualified Pension Benefits | U.S. equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,897 1,766  
United States Qualified and Non-qualified Pension Benefits | Non-U.S. equities      
Benefit Plan Information      
Total, before other items to reconcile 1,149 1,214  
United States Qualified and Non-qualified Pension Benefits | Non-U.S. equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,149 1,214  
United States Qualified and Non-qualified Pension Benefits | Index and long/short equity      
Benefit Plan Information      
Total, before other items to reconcile 578 607  
United States Qualified and Non-qualified Pension Benefits | Fixed income      
Benefit Plan Information      
Total, before other items to reconcile 5,184 5,652  
United States Qualified and Non-qualified Pension Benefits | Fixed income | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,107 1,059  
United States Qualified and Non-qualified Pension Benefits | Fixed income | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 4,066 4,561  
United States Qualified and Non-qualified Pension Benefits | U.S. government securities      
Benefit Plan Information      
Total, before other items to reconcile 1,551 1,622  
United States Qualified and Non-qualified Pension Benefits | U.S. government securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,095 1,032  
United States Qualified and Non-qualified Pension Benefits | U.S. government securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 456 590  
United States Qualified and Non-qualified Pension Benefits | Foreign government agency securities      
Benefit Plan Information      
Total, before other items to reconcile 126 388  
United States Qualified and Non-qualified Pension Benefits | Foreign government agency securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile   7  
United States Qualified and Non-qualified Pension Benefits | Foreign government agency securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 126 381  
United States Qualified and Non-qualified Pension Benefits | Preferred and convertible securities      
Benefit Plan Information      
Total, before other items to reconcile 12 15  
United States Qualified and Non-qualified Pension Benefits | Preferred and convertible securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 4 6  
United States Qualified and Non-qualified Pension Benefits | Preferred and convertible securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 8 9  
United States Qualified and Non-qualified Pension Benefits | U.S. corporate bonds      
Benefit Plan Information      
Total, before other items to reconcile 2,829 2,897  
United States Qualified and Non-qualified Pension Benefits | U.S. corporate bonds | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 9 8  
United States Qualified and Non-qualified Pension Benefits | U.S. corporate bonds | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 2,820 2,889  
United States Qualified and Non-qualified Pension Benefits | Non-U.S. corporate bonds      
Benefit Plan Information      
Total, before other items to reconcile 616 566  
United States Qualified and Non-qualified Pension Benefits | Non-U.S. corporate bonds | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 616 566  
United States Qualified and Non-qualified Pension Benefits | Other securities      
Benefit Plan Information      
Total, before other items to reconcile 11 32  
United States Qualified and Non-qualified Pension Benefits | Derivative instruments      
Benefit Plan Information      
Total, before other items to reconcile 39 132  
United States Qualified and Non-qualified Pension Benefits | Derivative instruments | Level 1      
Benefit Plan Information      
Total, before other items to reconcile (1) 6  
United States Qualified and Non-qualified Pension Benefits | Derivative instruments | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 40 126  
United States Qualified and Non-qualified Pension Benefits | Private equity      
Benefit Plan Information      
Total, before other items to reconcile 2,368 2,502  
United States Qualified and Non-qualified Pension Benefits | Private equity | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 24 15  
United States Qualified and Non-qualified Pension Benefits | Private equity | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (106) (74)  
United States Qualified and Non-qualified Pension Benefits | Derivatives      
Benefit Plan Information      
Total, before other items to reconcile (106) (74)  
United States Qualified and Non-qualified Pension Benefits | Derivatives | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (106) (74)  
United States Qualified and Non-qualified Pension Benefits | Growth equity      
Benefit Plan Information      
Total, before other items to reconcile 24 15  
United States Qualified and Non-qualified Pension Benefits | Growth equity | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 24 15  
United States Qualified and Non-qualified Pension Benefits | Partnership investments      
Benefit Plan Information      
Total, before other items to reconcile 2,450 2,561  
United States Qualified and Non-qualified Pension Benefits | Absolute return      
Benefit Plan Information      
Total, before other items to reconcile 2,058 2,173  
United States Qualified and Non-qualified Pension Benefits | Absolute return | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 253 26  
United States Qualified and Non-qualified Pension Benefits | Absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 41 52  
United States Qualified and Non-qualified Pension Benefits | Hedge funds and hedge fund of funds      
Benefit Plan Information      
Total, before other items to reconcile 1,409 1,807  
United States Qualified and Non-qualified Pension Benefits | Fixed income and other      
Benefit Plan Information      
Total, before other items to reconcile 299 78  
United States Qualified and Non-qualified Pension Benefits | Fixed income and other | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 253 26  
United States Qualified and Non-qualified Pension Benefits | Fixed income and other | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 46 52  
United States Qualified and Non-qualified Pension Benefits | Partnership investments - absolute return      
Benefit Plan Information      
Total, before other items to reconcile 355 288  
United States Qualified and Non-qualified Pension Benefits | Derivatives - absolute return      
Benefit Plan Information      
Total, before other items to reconcile (5)    
United States Qualified and Non-qualified Pension Benefits | Derivatives - absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile (5)    
United States Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents      
Benefit Plan Information      
Total, before other items to reconcile 891 904  
United States Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 102 287  
United States Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 6 86  
United States Qualified and Non-qualified Pension Benefits | Cash and cash equivalents      
Benefit Plan Information      
Total, before other items to reconcile 108 373  
United States Qualified and Non-qualified Pension Benefits | Cash and cash equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 102 287  
United States Qualified and Non-qualified Pension Benefits | Cash and cash equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 6 86  
United States Qualified and Non-qualified Pension Benefits | Cash and cash equivalents valued at net asset value [Member]      
Benefit Plan Information      
Total, before other items to reconcile 783 531  
International Qualified and Non-qualified Pension Benefits      
Benefit Plan Information      
Total, before other items to reconcile 5,697 5,998  
Other items to reconcile to fair value of plan assets (28) (41)  
Fair value of plan assets 5,669 5,957 5,758
International Qualified and Non-qualified Pension Benefits | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,681 1,583  
International Qualified and Non-qualified Pension Benefits | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 2,477 2,767  
International Qualified and Non-qualified Pension Benefits | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 481 502  
International Qualified and Non-qualified Pension Benefits | Equities      
Benefit Plan Information      
Total, before other items to reconcile 2,157 2,131  
International Qualified and Non-qualified Pension Benefits | Equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1,243 1,286  
International Qualified and Non-qualified Pension Benefits | Equities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 893 823  
International Qualified and Non-qualified Pension Benefits | Equities | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 4 4  
International Qualified and Non-qualified Pension Benefits | Growth equities      
Benefit Plan Information      
Total, before other items to reconcile 913 848  
International Qualified and Non-qualified Pension Benefits | Growth equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 718 672  
International Qualified and Non-qualified Pension Benefits | Growth equities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 195 176  
International Qualified and Non-qualified Pension Benefits | Value equities      
Benefit Plan Information      
Total, before other items to reconcile 521 618  
International Qualified and Non-qualified Pension Benefits | Value equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 494 595  
International Qualified and Non-qualified Pension Benefits | Value equities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 27 23  
International Qualified and Non-qualified Pension Benefits | Core equities      
Benefit Plan Information      
Total, before other items to reconcile 706 647  
International Qualified and Non-qualified Pension Benefits | Core equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 31 19  
International Qualified and Non-qualified Pension Benefits | Core equities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 671 624  
International Qualified and Non-qualified Pension Benefits | Core equities | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 4 4  
International Qualified and Non-qualified Pension Benefits | Equities valued at net asset value      
Benefit Plan Information      
Total, before other items to reconcile 17 18  
International Qualified and Non-qualified Pension Benefits | Fixed income      
Benefit Plan Information      
Total, before other items to reconcile 2,310 2,915  
International Qualified and Non-qualified Pension Benefits | Fixed income | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 313 133  
International Qualified and Non-qualified Pension Benefits | Fixed income | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 1,213 1,904  
International Qualified and Non-qualified Pension Benefits | Fixed income | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 14 15  
International Qualified and Non-qualified Pension Benefits | Domestic government debt      
Benefit Plan Information      
Total, before other items to reconcile 633 623  
International Qualified and Non-qualified Pension Benefits | Domestic government debt | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 283 87  
International Qualified and Non-qualified Pension Benefits | Domestic government debt | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 346 533  
International Qualified and Non-qualified Pension Benefits | Domestic government debt | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 4 3  
International Qualified and Non-qualified Pension Benefits | Foreign government agency securities      
Benefit Plan Information      
Total, before other items to reconcile 206 715  
International Qualified and Non-qualified Pension Benefits | Foreign government agency securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile   45  
International Qualified and Non-qualified Pension Benefits | Foreign government agency securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 206 670  
International Qualified and Non-qualified Pension Benefits | Corporate debt securities      
Benefit Plan Information      
Total, before other items to reconcile 701 714  
International Qualified and Non-qualified Pension Benefits | Corporate debt securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 30 1  
International Qualified and Non-qualified Pension Benefits | Corporate debt securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 661 701  
International Qualified and Non-qualified Pension Benefits | Corporate debt securities | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 10 12  
International Qualified and Non-qualified Pension Benefits | Fixed income securities valued at net asset value [Member]      
Benefit Plan Information      
Total, before other items to reconcile 770 863  
International Qualified and Non-qualified Pension Benefits | Private equity      
Benefit Plan Information      
Total, before other items to reconcile 160 154  
International Qualified and Non-qualified Pension Benefits | Private equity | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1 3  
International Qualified and Non-qualified Pension Benefits | Private equity | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 5 5  
International Qualified and Non-qualified Pension Benefits | Private equity | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 4 4  
International Qualified and Non-qualified Pension Benefits | Real estate      
Benefit Plan Information      
Total, before other items to reconcile 10 12  
International Qualified and Non-qualified Pension Benefits | Real estate | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1 3  
International Qualified and Non-qualified Pension Benefits | Real estate | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 5 5  
International Qualified and Non-qualified Pension Benefits | Real estate | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 4 4  
International Qualified and Non-qualified Pension Benefits | Real estate valued at net asset value      
Benefit Plan Information      
Total, before other items to reconcile 126 119  
International Qualified and Non-qualified Pension Benefits | Partnership investments      
Benefit Plan Information      
Total, before other items to reconcile 24 23  
International Qualified and Non-qualified Pension Benefits | Absolute return      
Benefit Plan Information      
Total, before other items to reconcile 596 605  
International Qualified and Non-qualified Pension Benefits | Absolute return | Level 1      
Benefit Plan Information      
Total, before other items to reconcile (2)    
International Qualified and Non-qualified Pension Benefits | Absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 19 6  
International Qualified and Non-qualified Pension Benefits | Absolute return | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 459 479  
International Qualified and Non-qualified Pension Benefits | Insurance      
Benefit Plan Information      
Total, before other items to reconcile 456 476  
International Qualified and Non-qualified Pension Benefits | Insurance | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 456 476  
International Qualified and Non-qualified Pension Benefits | Derivatives - absolute return      
Benefit Plan Information      
Total, before other items to reconcile 13 (4)  
International Qualified and Non-qualified Pension Benefits | Derivatives - absolute return | Level 1      
Benefit Plan Information      
Total, before other items to reconcile (2)    
International Qualified and Non-qualified Pension Benefits | Derivatives - absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 15 (4)  
International Qualified and Non-qualified Pension Benefits | Other - absolute return      
Benefit Plan Information      
Total, before other items to reconcile 7 13  
International Qualified and Non-qualified Pension Benefits | Other - absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 4 10  
International Qualified and Non-qualified Pension Benefits | Other - absolute return | Level 3      
Benefit Plan Information      
Total, before other items to reconcile 3 3  
International Qualified and Non-qualified Pension Benefits | Other valued at net asset value      
Benefit Plan Information      
Total, before other items to reconcile 1 3  
International Qualified and Non-qualified Pension Benefits | Hedge funds      
Benefit Plan Information      
Total, before other items to reconcile 119 117  
International Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents      
Benefit Plan Information      
Total, before other items to reconcile 474 193  
International Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 126 161  
International Qualified and Non-qualified Pension Benefits | Cash and Cash Equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 347 29  
International Qualified and Non-qualified Pension Benefits | Cash and cash equivalents      
Benefit Plan Information      
Total, before other items to reconcile 473 190  
International Qualified and Non-qualified Pension Benefits | Cash and cash equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 126 161  
International Qualified and Non-qualified Pension Benefits | Cash and cash equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 347 29  
International Qualified and Non-qualified Pension Benefits | Cash and cash equivalents valued at net asset value [Member]      
Benefit Plan Information      
Total, before other items to reconcile 1 3  
Postretirement Benefits      
Benefit Plan Information      
Total, before other items to reconcile 1,358 1,428  
Other items to reconcile to fair value of plan assets 9 8  
Fair value of plan assets $ 1,367 1,436 $ 1,405
Percentage of plan assets within 401h account 39.00%    
Postretirement Benefits | Level 1      
Benefit Plan Information      
Total, before other items to reconcile $ 687 724  
Postretirement Benefits | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 392 393  
Postretirement Benefits | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (4) (3)  
Postretirement Benefits | Equities      
Benefit Plan Information      
Total, before other items to reconcile 616 676  
Postretirement Benefits | Equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 567 621  
Postretirement Benefits | U.S. equities      
Benefit Plan Information      
Total, before other items to reconcile 508 565  
Postretirement Benefits | U.S. equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 508 565  
Postretirement Benefits | Non-U.S. equities      
Benefit Plan Information      
Total, before other items to reconcile 59 56  
Postretirement Benefits | Non-U.S. equities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 59 56  
Postretirement Benefits | Index and long/short equity      
Benefit Plan Information      
Total, before other items to reconcile 49 55  
Postretirement Benefits | Fixed income      
Benefit Plan Information      
Total, before other items to reconcile 461 457  
Postretirement Benefits | Fixed income | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 71 68  
Postretirement Benefits | Fixed income | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 390 388  
Postretirement Benefits | U.S. government securities      
Benefit Plan Information      
Total, before other items to reconcile 263 254  
Postretirement Benefits | U.S. government securities | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 71 68  
Postretirement Benefits | U.S. government securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 192 186  
Postretirement Benefits | Foreign government agency securities      
Benefit Plan Information      
Total, before other items to reconcile 8 17  
Postretirement Benefits | Foreign government agency securities | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 8 17  
Postretirement Benefits | U.S. corporate bonds      
Benefit Plan Information      
Total, before other items to reconcile 153 146  
Postretirement Benefits | U.S. corporate bonds | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 153 146  
Postretirement Benefits | Non-U.S. corporate bonds      
Benefit Plan Information      
Total, before other items to reconcile 35 34  
Postretirement Benefits | Non-U.S. corporate bonds | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 35 34  
Postretirement Benefits | Other securities      
Benefit Plan Information      
Total, before other items to reconcile   1  
Postretirement Benefits | Derivative instruments      
Benefit Plan Information      
Total, before other items to reconcile 2 5  
Postretirement Benefits | Derivative instruments | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 2 5  
Postretirement Benefits | Private equity      
Benefit Plan Information      
Total, before other items to reconcile 133 160  
Postretirement Benefits | Private equity | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1 1  
Postretirement Benefits | Private equity | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (4) (3)  
Postretirement Benefits | Derivatives      
Benefit Plan Information      
Total, before other items to reconcile (4) (3)  
Postretirement Benefits | Derivatives | Level 3      
Benefit Plan Information      
Total, before other items to reconcile (4) (3)  
Postretirement Benefits | Growth equity      
Benefit Plan Information      
Total, before other items to reconcile 1 1  
Postretirement Benefits | Growth equity | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 1 1  
Postretirement Benefits | Partnership investments      
Benefit Plan Information      
Total, before other items to reconcile 136 162  
Postretirement Benefits | Absolute return      
Benefit Plan Information      
Total, before other items to reconcile 80 79  
Postretirement Benefits | Absolute return | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 10 1  
Postretirement Benefits | Absolute return | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 2 2  
Postretirement Benefits | Hedge funds and hedge fund of funds      
Benefit Plan Information      
Total, before other items to reconcile 54 66  
Postretirement Benefits | Fixed income and other      
Benefit Plan Information      
Total, before other items to reconcile 12 3  
Postretirement Benefits | Fixed income and other | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 10 1  
Postretirement Benefits | Fixed income and other | Level 2      
Benefit Plan Information      
Total, before other items to reconcile 2 2  
Postretirement Benefits | Partnership investments - absolute return      
Benefit Plan Information      
Total, before other items to reconcile 14 10  
Postretirement Benefits | Cash and Cash Equivalents      
Benefit Plan Information      
Total, before other items to reconcile 68 56  
Postretirement Benefits | Cash and Cash Equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 38 33  
Postretirement Benefits | Cash and Cash Equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile   3  
Postretirement Benefits | Cash and cash equivalents      
Benefit Plan Information      
Total, before other items to reconcile 38 36  
Postretirement Benefits | Cash and cash equivalents | Level 1      
Benefit Plan Information      
Total, before other items to reconcile 38 33  
Postretirement Benefits | Cash and cash equivalents | Level 2      
Benefit Plan Information      
Total, before other items to reconcile   3  
Postretirement Benefits | Cash and cash equivalents valued at net asset value [Member]      
Benefit Plan Information      
Total, before other items to reconcile $ 30 $ 20