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Leases (Maturities of Lease Liabilities Under Previous Lease Standard) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Capital Leases And Financing Obligations [Abstract] |
Total | $ 393
Less than 1 year | 4
1 to 3 years | 11
3 to 5 years | 132
5 years and thereafter | 246
Imputed Interest On Capital Leases And Financing Obligations [Abstract] |
Total | 205
Less than 1 year | 20
1 to 3 years | 38
3 to 5 years | 37
5 years and thereafter | 110
Minimum Rental Commitments [Abstract] |
Total | 581
Less than 1 year | 82
1 to 3 years | 133
3 to 5 years | 111
5 years and thereafter | $ 255

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