Debt and Borrowing Arrangements - Uncommitted and Committed Credit Lines Available (Details) - USD ($) |
Jun. 30, 2021 |
Dec. 31, 2020 |
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Debt Instrument [Line Items] | ||||
Amount Outstanding | $ 64,000,000 | $ 29,000,000 | ||
Line of Credit | Credit Facility Expiring February 27, 2024 | ||||
Debt Instrument [Line Items] | ||||
Facility Amount | [1] | 4,500,000,000 | 4,500,000,000 | |
Borrowed Amount | [1] | 0 | 0 | |
Line of Credit | Multi-year Senior Unsecured Revolving Credit Facility Expiring February 27, 2024 | Revolving Credit Agreement | ||||
Debt Instrument [Line Items] | ||||
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) | 38,100,000,000 | |||
Line of Credit | Multi-year Senior Unsecured Revolving Credit Facility Expiring February 27, 2024 | Revolving Credit Agreement | Minimum | ||||
Debt Instrument [Line Items] | ||||
Total shareholders' equity, excluding accumulated other comprehensive earnings/(losses) | 24,600,000,000 | |||
Line of Credit | ||||
Debt Instrument [Line Items] | ||||
Amount Outstanding | 51,000,000 | 29,000,000 | ||
Line of Credit | Uncommitted credit facilities | ||||
Debt Instrument [Line Items] | ||||
Facility Amount | 1,496,000,000 | 1,487,000,000 | ||
Amount Outstanding | 51,000,000 | 29,000,000 | ||
Line of Credit | Credit Facility Expiring February 24, 2021 | ||||
Debt Instrument [Line Items] | ||||
Facility Amount | [1] | 0 | 1,500,000,000 | |
Amount Outstanding | [1] | 0 | 0 | |
Line of Credit | Credit Facility Expiring February 23, 2022 | ||||
Debt Instrument [Line Items] | ||||
Facility Amount | [1] | 2,500,000,000 | 0 | |
Amount Outstanding | [1] | $ 0 | $ 0 | |
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