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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Future Minimum Lease Payments For Operating Leases [Abstract]
Minimum operating lease payments - 2020	$ 147
Minimum operating lease payments - 2021	302
Minimum operating lease payments - 2022	267
Minimum operating lease payments - 2023	226
Minimum operating lease payments - 2024	216
Minimum operating lease payments - later years	777
Total operating lease payments	1,935
Operating lease payments - amount representing interest	270
Operating lease liabilities - present value of minimum lease liabilities	1,665
Future Minimum Lease Payments For Finance Leases [Abstract]
Minimum finance lease payments - 2020	84
Minimum finance lease payments - 2021	142
Minimum finance lease payments - 2022	127
Minimum finance lease payments - 2023	88
Minimum finance lease payments - 2024	75
Minimum finance lease payments - later years	124
Total finance lease payments	640
Finance lease payments - amount representing interest	88
Finance lease liabilities - present value of minimum lease liabilities	552
Minimum lease payments - 2020	231
Minimum lease payments - 2021	444
Minimum lease payments - 2022	394
Minimum lease payments - 2023	314
Minimum lease payments - 2024	291
Minimum lease payments - later years	901
Total minimum lease payments	2,575
Lease payments - amount representing interest	358
Total lease liabilities	$ 2,217	$ 2,438

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