XML 102 R82.htm IDEA: XBRL DOCUMENT v3.3.1.900
Compensation and Benefit Plans (Plan Assets - Changes in Level 3 Fair Value) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Plans    
Change in plan assets    
Fair value of plan assets at beginning of year $ 3,454 $ 3,477
Actual return on plan assets:    
Fair value of plan assets at end of year 3,298 3,454
Pension Plans | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 289 390
Actual return on plan assets:    
Relating to assets still held at end of period 47 114
Relating to assets sold during the period (17) (44)
Purchases 38 13
Dispositions (143) (184)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at end of year 214 289
Postretirement Benefits Other Than Pensions    
Change in plan assets    
Fair value of plan assets at beginning of year 2,086 2,065
Actual return on plan assets:    
Fair value of plan assets at end of year 2,036 2,086
Postretirement Benefits Other Than Pensions | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 105 164
Actual return on plan assets:    
Relating to assets still held at end of period (6) 18
Relating to assets sold during the period 15 (1)
Purchases 7 9
Dispositions (47) (85)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at end of year $ 74 $ 105