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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Future Minimum Lease Payments For Operating Leases [Abstract]
Minimum operating lease payments - 2021	$ 325
Minimum operating lease payments - 2022	273
Minimum operating lease payments - 2023	229
Minimum operating lease payments - 2024	220
Minimum operating lease payments - 2025	216
Minimum operating lease payments - later years	567
Total operating lease payments	1,830
Operating lease paymetns - amount representing interest	(226)
Operating lease liabilities - present value of minimum lease liabilities	1,604
Future Minimum Lease Payments For Finance Leases [Abstract]
Minimum finance lease payments - 2021	135
Minimum finance lease payments - 2022	111
Minimum finance lease payments - 2023	81
Minimum finance lease payments - 2024	68
Minimum finance lease payments - 2025	45
Minimum finance lease payments - later years	77
Total finance lease payments	517
Finance lease payments - amount representing interest	(68)
Finance lease liabilities - present value of minimum lease liabilities	449
Minimum lease payments - 2021	460
Minimum lease payments - 2022	384
Minimum lease payments - 2023	310
Minimum lease payments - 2024	288
Minimum lease payments - 2025	261
Minimum lease payments - later years	644
Total minimum lease payments	2,347
Lease payments - amount representing interest	(294)
Total lease liabilities	$ 2,053	$ 2,438

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Amount of lessee's undiscounted obligation for lease payments, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments, due in third fiscal year following latest fiscal year.

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