Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Actual Return on Assets:    
Fair value of plan assets at end of year $ 27,510 $ 26,202
Fair Value, Inputs, Level 3
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 6,833 5,158
Actual Return on Assets:    
Assets Held at End of Year 287 467
Assets Sold During the Year 266 6
Purchases 2,130 2,307
Sales (2,256) (1,105)
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 7,260 6,833
Fair Value, Inputs, Level 3 | Global Bonds
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 138 80
Actual Return on Assets:    
Assets Held at End of Year (1) 1
Assets Sold During the Year 0 (3)
Purchases 165 71
Sales (79) (11)
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 223 138
Fair Value, Inputs, Level 3 | Hedge Funds
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 2,829 2,132
Actual Return on Assets:    
Assets Held at End of Year 229 59
Assets Sold During the Year 5 5
Purchases 1,676 1,300
Sales (1,001) (667)
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 3,738 2,829
Fair Value, Inputs, Level 3 | Structured Products(1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 1,039 948
Actual Return on Assets:    
Assets Held at End of Year 81 85
Assets Sold During the Year 54 4
Purchases 145 144
Sales (228) (142)
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 1,091 1,039
Fair Value, Inputs, Level 3 | Other(2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 1,416 1,354
Actual Return on Assets:    
Assets Held at End of Year 71 163
Assets Sold During the Year 153 0
Purchases 143 184
Sales (386) (285)
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 1,397 1,416
Fair Value, Inputs, Level 3 | Other
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 1,411 644
Actual Return on Assets:    
Assets Held at End of Year (93) 159
Assets Sold During the Year 54 0
Purchases 1 608
Sales (562) 0
Settlements 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year $ 811 $ 1,411