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Debt Debt Obligation Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Maturities [Abstract]    
Debt maturities - 2019 $ 830  
Debt maturities - 2020 572  
Debt maturities - 2021 918  
Debt maturities - 2022 1,558  
Debt maturities - 2023 1,553  
Debt maturities - Thereafter 17,795  
Total Debt excluding capital leases [1],[2] 22,807  
Total Debt excluding capital leases, Fair Value [2] 24,089 $ 25,100
Outstanding variable rate debt $ 0  
Weighted Average Interest Rate on Debt and Capital Lease Obligations [Abstract]    
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2019 4.80%  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2020 5.60%  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2021 4.30%  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2022 4.10%  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2023 3.50%  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - Thereafter 4.80%  
Total Debt, Weighted Average Effective Interest Rate 4.70%  
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Subordinated notes related to financial covenants $ 500  
[1] Amount also excludes unamortized fair value adjustment under acquisition method accounting related to capital leases.
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