Leases Leases (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]
Cash paid for amounts included in the measurement of lease liability - operating cash flows	$ 273	$ 289
ROU assets obtained in exchange for new lease liabilities	$ 63	$ 70	$ 341
Weighted-average remaining lease term	7 years	8 years
Weighted-average discount rate	3.40%	3.40%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2022	$ 250
2023	231
2024	209
2025	195
2026	179
Thereafter	379
Total undiscounted cash flows	1,443
Less: interest	148
Other Assets
Assets and Liabilities, Lessee [Abstract]
ROU asset	1,110	$ 1,314
Lessee, Lease, Description [Line Items]
ROU asset	1,110	1,314
Other Liabilities [Member]
Assets and Liabilities, Lessee [Abstract]
Lease liability	1,295	1,470
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lease liability	1,295	1,470
Lessee, Lease, Description [Line Items]
Lease liability	$ 1,295	$ 1,470

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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