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Retirement Benefits Amounts in Paragraphs - Retirement Benefits (Details 9) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plans Disclosure (Amounts in paragraphs)      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 481 $ 403 $ 344
Pension and post-retirement benefits disclosures (Amounts in paragraphs)      
Accumulated benefit obligation for all defined benefit pension plans 36,500 31,900  
Pension Benefits      
Defined Benefit Plan Disclosure (Table Amounts)      
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year 60    
Defined Contribution Plans Disclosure (Amounts in paragraphs)      
Expected 2019 employer contributions 96    
Defined Benefit Plan, Plan Assets, Contributions by Employer 221 370  
Pension Benefits | Voluntary Contributions [Member]      
Defined Contribution Plans Disclosure (Amounts in paragraphs)      
Defined Benefit Plan, Plan Assets, Contributions by Employer 120    
OPB contributions      
Defined Benefit Plan Disclosure (Table Amounts)      
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year (4)    
Defined Contribution Plans Disclosure (Amounts in paragraphs)      
Expected 2019 employer contributions 44    
Defined Benefit Plan, Plan Assets, Contributions by Employer 42 38  
U.S. Equity Securities [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 0 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency Daily, monthly    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 30 days    
International Equity Securities [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 0 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency Daily, monthly    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 30 days    
Fixed Income Funds      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 0 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency daily, monthly or quarterly    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 30 days    
Hedge Funds [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 8 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency monthly or quarterly    
OpportunisticFunds      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1,300 1,100  
Private Equity Funds [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1,900 1,800  
Average investment term, alternative investments 10 years    
Real Estate Funds      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 60 $ 73  
Average investment term, alternative investments 10 years    
Minimum | Hedge Funds [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 30 days    
Minimum | OpportunisticFunds      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Average investment term, alternative investments 5 years    
Maximum | Hedge Funds [Member]      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 95 days    
Maximum | OpportunisticFunds      
Information About Plan Assets (Amounts in paragraphs) [Abstract]      
Average investment term, alternative investments 10 years